六年級解方程專項練習(xí)200題
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1、 授課:XXX 六年級解方程專項練習(xí)200題(有答案) 授課:XXX (1)x﹣=, (2) x××=, (3) ﹣4x=, (4) 8×2.5﹣2x=13.6 (5) 0.78:x=3:5, (6)1﹣20%x=0.4, (8) 1÷(x﹣)=6, (9)2x﹣x=1.2, (10)9×3﹣1.7x=13.4,
2、 (11)x﹣25%x=24, (12)x﹣+0.2=, (13)0.6x+90%x=78, (14)20%x﹣2.4×3=0.8, (15)x﹣x=42, 授課:XXX (16)0.6x+3×2.5=67.5, (17)1÷(x﹣0.45)=5, (18)x﹣2.25=8.25, (1
3、9):x=3:12, (20)x+0.8=5.6, (21) 1.4:x=1:0.75, (22) x×(2﹣)=24, (23) 4x﹣=3, (24)12x+7×0.3=20.1, (25)x+x=, (26)x:42=, (27)×0.5+x=, (
4、28)0.8:=0.48:x, (29)χ﹣χ=, 授課:XXX (30)42:=χ: (31)5x﹣0.4=75%, ( 32) 6x﹣0.9=4.5, (33)2(x﹣3)=5.8, (34) 1.6x=6.4, (35) 4x﹣3×9=29, (36)16+8x=40, (37) x÷1.1=3, (38)+2x=, (39)×
5、3﹣7x=1.04, (40)x﹣1﹣x=2, (41)x﹣x=14, (42)3x﹣x=, (43)=, (44)1.2:=, (45)=:, (46):=x:0.8, 授課:XXX (47)x=+1, (48)1﹣25%X+25%x=+25%x, (49)=, (50)×X=, (51) 5:8=x:32,
6、 (52)2x+3×0.9=24.9, (53)5.3x﹣2.9x=, (54)×(7﹣2.8x)=1.5, (55)x:0.3=:, (56)150%x+66=99 (57)x+6﹣0.8x=16 (58) (59) (60)3÷(X﹣)=1.3 (61)(X+0.5):2=(X﹣4):, (62) X÷0.05=3.528,
7、 授課:XXX (63)2X﹣4×6=80, (64)4×4.5﹣3X=6.38, (65)4X﹣7.2=10, (66)11.5X+X=20, (67)3.8×12+15X=87.6, (68)6X+5=17, (69)0.6×(2.5+X)=4.2, (70):=X:, (71), (72) (73), (
8、74)4(+x)=, (75)×0.25+x=, (76)x﹣, (77)200:6=x:, (78)4÷X=, (79)8(x﹣2)=2(x+7), 授課:XXX (80):18%=, (81)﹣2x=, (82)x+x=46, (83):x=:, (84)=,
9、 (85)5(3x﹣4)﹣2(x﹣1)=5(2x﹣1) (86)=, (87)8(2X﹣7)=5(X+13), (88)3(x+4.5)=60, (89)1.6x+2.4=7.52, (90)3(x﹣0.8)=6.3, (91)28.4﹣5x=5.8, (92)x:= (93)+2x=, (94)x=15%,
10、 (95)x﹣x=, 授課:XXX (96)x+50%x=6, (97):x=0.3:12, (98)4x+2(8﹣x)=26, (99)x﹣=0, (100)+x=1, (101)x×(+)=, (102), (103), (104)x﹣, (105)x×, (106)5x+35=650,
11、 (107)720÷3x=80, (108)3.6x﹣0.9x=8.1, (109)4×4.5﹣3x=6, (110)=, (111)6×3﹣1.8X=7.2, 授課:XXX (112)÷x=, (113)x÷=42, (114)x+=, (115)7x÷3=8.19, (116)12:0.6=x:,
12、 (117)3(x+2)=4(x+1), (118)3x﹣70%x=9.2, (119) 6+x=240, (120)22.5﹣0.4x=12.5, (121)x:3.5=4:2, (122)x﹣0.8x﹣6=16, (123):=x:8, (124), (125)x:15=:, (126)x+x=,
13、 (127)x×50%﹣x=5, 授課:XXX (128)1﹣x=, (129)2.5+1x=3, (130)3x﹣2=4, (131)8.5﹣3x=2, (132)3÷x=4, (133)x﹣5%=17.54, (134):=:(4﹣x), (135) 6x+31=49, (136) 7x÷3=8.19, (137) 32.8﹣9x=17
14、.5, (138) x﹣0.36x=16, (139) 6×7+3x=69, (140) 6x+2x﹣56=0, (141) 3x﹣0.45×4=2.7, (142) 5.8x﹣4.6x=0.96, (143) 8.4÷(9﹣x)=3, 授課:XXX (144) 3x÷1.2=8, (145)5x+28=71,
15、 (146)8.7﹣1.2x=3.9, (147)8x﹣2.6x=37.8, (148)0.75x﹣0.95×4=8.5, (149)54÷2+3x=72, (150)8x﹣2.6=37.8, (151)x÷=, (152)x+30%x=26, (153) 7.8﹣3x=3.6, (154) 6×3﹣1.8x=7.2, (155)10:x=4.5:
16、0.8, (156):=x:, (157)X﹣7.65=4.64, (158)28.25﹣X=8.25, (159)X﹣(3.6+2.97)=12.42, (160)÷x=, (161)14.5=5.5, 授課:XXX (162)x﹣80%x=48, (163)75%x﹣5×=6, (164)x﹣6.8=15.4, (165
17、)1.9x=5.7, (166)4.3y﹣y=4.6, (167)5x+2.6=7.6, (168) x﹣1.5=12.9, (169) 9x+5x=8.4, (170) 6.8+3.2x=14.8, (171)5÷x=, (172)﹣x=, (173)4.5×﹣3x=1.5, (174)(1+25%)x=0.5, (175)x﹣4
18、0%x=9, (176)x×20%=15.2, (178)x﹣x=, (179)x÷75%=3, 授課:XXX (180)4x﹣, (181):x=:4.5, (182)(x﹣4.5)×6=12.5, (183)27﹣17x=13.4, (184)9.6+3x=3.24×5, (185)2x+5=5x﹣7,
19、 (186) 3(x﹣2)=2﹣5(x﹣2), (187)4x﹣3(20﹣x)+4=0, (188)﹣=1, (189)4x﹣5×6=12, (190)8x﹣3x=15.6, (191)30×(x÷4)=60, (192)7.2×0.5﹣3x=1.2, (193)5x﹣2.4×5=8, (194)
20、+x=×2, (195)5x+2.4×15=66, 授課:XXX (196)3.2x+2.8x-x=1, (197)2.5×16-8x=12, (198)9.6-3x=6.3, (199)5(x+6)=75, (200)x÷0.7+0.9×3=4, 授課:XXX 解方
21、程專項練習(xí)200題答案: (1)x﹣=, =, , x=; (2) x××=, x=, x×21=×21, x=12; (3) ﹣4x=, ﹣4x+4x=+4x, =+4x, ÷4=4x÷4, x=. (4) 8×2.5﹣2x=13.6 20﹣2x=13.6, 13.6+2X=20, 2X=6.4, x=3.2; (5) 0.78:x=3:5, 3x=0.78×
22、5, 3x=3.9, x=1.3 (6)1﹣20%x=0.4, 1﹣20%x+20%x=0.4+20%x, 0.4+20%x=1, 0.4+20%x﹣0.4=1﹣0.4, 20%x=0.6, 20%x×=0.6×, x=3; (8) 1÷(x﹣)=6, 1÷(x﹣)×(x﹣)=6×(x﹣), 1=6×(x﹣), 6x﹣6×=1, 6x﹣3=1,
23、6x=4, 6x÷6=4÷6, x= (9)2x﹣x=1.2, x(2﹣)=1.2, x=1.2, x÷=1.2÷, x=1; (10)9×3﹣1.7x=13.4, 27﹣1.7x=13.4, 27﹣1.7x+1.7x=13.4+1.7x, 13.4+1.7x=27, 13.4+1.7x﹣13.4=27﹣13.4, 1.7x=13.6, 1.7x÷1.7=13.6÷1.7,
24、 x=8 (11)x﹣25%x=24, 75%x=24, 75%x÷75%=24÷75%, x=32; (12)x﹣+0.2=, x﹣0.6=, x﹣0.6+0.6=+0.6, x=, x÷=÷, x=1 (13)0.6x+90%x=78, 授課:XXX 1.5x=78, 1.5x÷1.5=78÷1.5, x=52; (14)20%x﹣2.4×3=0.8,
25、 20%x﹣7.2=0.8, 20%x﹣7.2+7.2=0.8+7.2, 20%x÷20%=8÷20%, x=40; (15)x﹣x=42, x=42, x÷=42÷, x=252 (16)0.6x+3×2.5=67.5, 0.6x+7.5=67.5, 0.6x+7.5﹣7.5=67.5﹣7.5, 0.6x=60, 0.6x÷0.6=60÷0.6,
26、 x=100; (17)1÷(x﹣0.45)=5, ÷(x﹣0.45)×(x﹣0.45)=(x﹣0.45), x﹣2.4=1.6, x﹣2.4+2.4=1.6+2.4, x=4, x÷=4÷, x= (18)x﹣2.25=8.25, x﹣2.25+2.25=8.25+2.25, x=10.5; (19):x=3:12, 3x=×12, 3x÷3=9÷3, x=3 (20)x+0.8=5.6, x+0.8﹣0.8=5.6﹣0
27、.8, x=4.8, x×=4.8×, x=8. (21) 1.4:x=1:0.75, x=1.4×0.75, x=1.05 (22) x×(2﹣)=24, x×=24, x×÷=24÷, x=20; (23) 4x﹣=3, 4x﹣+=3+, 4x=4, 4x÷4=4÷4, x=1 (24)12x+7×0.3=20.1, 12x+2.1=20.1, 12x+2
28、.1﹣2.1=20.1﹣2.1, 12x÷12=18÷12, x=1.5; (25)x+x=, x=, x×, x=; (26)x:42=, 10x=42×, 10x÷10=30÷10, x=3 (27)×0.5+x=, 授課:XXX 0.75+x=3.75, 0.75+x﹣0.75=3.75﹣0.75, x=3,
29、 x÷=3÷, x=6; (28)0.8:=0.48:x, 0.8x=×0.48, 0.8x=0.2, 0.8x÷0.8=0.2÷0.8, x= (29)χ﹣χ=, x=, x=, x=3; (30)42:=χ: x=42×, x=30, x=50; (31)5x﹣0.4=75%, 5x﹣0.4+0.4=75%+0.4, 5x÷5=1.15÷5, x=
30、0.23 ( 32) 6x﹣0.9=4.5, 6x﹣0.9+0.9=4.5+0.9, 6x=5.4, 6x÷6=5.4÷6, x=0.9; (33)2(x﹣3)=5.8, 2(x﹣3)÷2=5.8÷2 x﹣3=2.9, x﹣3+3=2.9+3, x=5.9; (34) 1.6x=6.4, 1.6x÷1.6=6.4÷1.6, x=4; (35) 4x﹣3×9=29, 4x﹣27=29, 4x﹣27+27=29+
31、27, 4x=56, 4x÷4=56÷4, x=14; (36)16+8x=40, 16+8x﹣16=40﹣16, 8x=24, 8x÷8=24÷8, x=3; (37) x÷1.1=3, x÷1.1×1.1=3×1.1, x=3.3 (38)+2x=, +2x=, 2x=, 2x÷2=÷2, x=; (39)×3﹣7x=1.04, 2.16﹣7x=1.04, 2.16﹣7x﹣
32、1.04=1.04﹣1.04, 1.12﹣7x=0, 7x÷7=1.12÷7, x=0.16; (40)x﹣1﹣x=2, x﹣1=2, x﹣1+1=2+1, x=3, x=3, x=18; (41)x﹣x=14, 授課:XXX x=14, x=14, x=18; (42)3x﹣x=, x=, x=, x=; (43)=, 2.4x=72×0.26, 2.4x=18.72, 2
33、.4x÷2.4=18.72÷2.4, x=7.8; (44)1.2:=, x=1.2×5, x=6, x=6, x=9; (45)=:, x=18×, x=, x=, x=12; (46):=x:0.8, x=×0.8, x=0.04, x=0.2; (47)x=+1, x×=×, x=1 (48) 1﹣25%X+25%x=+25%x, 0.25x+0.25﹣0.25=1﹣0.25, 0.25x=0.75, x=3
34、; (49)=, 0.25x=1.25×1.6, 0.25x÷0.25=1.25×1.6÷0.25, x=8; (50)×X=, ×X÷=, x=; (51) 5:8=x:32, 8x=5×32, 8x÷8=5×32÷8, x=20 (52)2x+3×0.9=24.9, 2x+2.7=24.9, 2x+2.7﹣2.7=24.9﹣2.7, 2x÷2=22.2÷2, x=11.1; (53)5.3x﹣2.
35、9x=, 2.4x=, 2.4x÷2.4=÷2.4, x=; (54)×(7﹣2.8x)=1.5, ×(7﹣2.8x)=1.5, 7﹣2.8x=2.1, 7﹣2.8x+2.8x=2.1+2.8x, 7﹣2.1=2.1+2.8x﹣2.1, 4.9÷2.8=2.8x÷2.8, x=1.75; (55)x:0.3=:, x=0.3×, 授課:XXX x=, x=
36、 (56) 150%x+66=99 1.5x+66=99 1.5x=33 x=22 (57)x+6﹣0.8x=16 0.2x+6=16 0.2x=10 x=50 (58) x=14.4 (59) 0.55x=5.5 x=10 (60)3÷(X﹣)=1.3 3÷(X﹣)×(x﹣)=1.3×(x﹣), 3=1.3x﹣0.78, 3+0.78=1.3x﹣0.78+0.78,
37、 4.68=1.3x, 4.68÷1.3=1.3x÷1.3, x=3.6; (61)(X+0.5):2=(X﹣4):, ×(x﹣4)=(x+0.5)×, x﹣×4=x+×0.5, x﹣10﹣x=x+x, 2.25x﹣10+10=0.125+10, 2.25x÷2.25=10.125÷2.25, x=4.5 (62) X÷0.05=3.528, X÷0.05×0.05=3.528×0.05, X=0.1764; (63)2X﹣4×6
38、=80, 2X﹣24=80, 2X﹣24+24=80+24, 2X=104, 2X÷2=104÷2, X=52; (64)4×4.5﹣3X=6.38, 18﹣3X=6.38, 18﹣3X+3X=6.38+3X, 6.38+3X=18, 6.38+3X﹣6.38=18﹣6.38, 3X=11.62, 3X÷3=11.62÷3, X=; (65)4X﹣7.2=10, 4X﹣7.2+7.2=10+7.2, 4X=17.
39、2, 4X÷4=17.2÷4, X=4.3; (66)11.5X+X=20, 12.5X=20, 12.5X÷12.5=20÷12.5, X=1.6; (67)3.8×12+15X=87.6, 45.6+15X=87.6, 45.6+15X﹣45.6=87.6﹣45.6, 15X=42, 15X÷15=42÷15, X=2.8 (68)6X+5=17, 6x+5﹣5=17﹣5, 6x÷6=12÷6,
40、 x=2; (69)0.6×(2.5+X)=4.2, 0.6×(2.5+X)÷0.6=4.2÷0.6, 2.5+x=7, 2.5+x﹣2.5=7﹣2.5, x=4.5; (70):=X:, x=×, x÷=, x=0.6 授課:XXX (71), , , ; (72) , , , , ; (73), , , (74)4(+x)=, +
41、4x=, +4x﹣=﹣, 4x=4, x=1; (75)×0.25+x=, 0.2+x=, 0.2+x﹣0.2=﹣0.2, x=, x= (76)x﹣, , , x=; (77)200:6=x:, 6x=200×, 6x÷6=480÷6, x=80 (78)4÷X=, 4÷X×X=X,
42、 X=4, X÷=4÷, X=10; (79)8(x﹣2)=2(x+7), 8X﹣16=2X+14, 6X﹣16=14, 6X=30, X=5; (80):18%=, X=0.18×6.5, X=1.17, X=7.8 (81)﹣2x=, ﹣2x+2x=+2x, +2x=, +2x﹣=﹣, 2x=, 授課:XXX 2x÷
43、2=÷2, x=; (82)x+x=46, x(+)=46, x=46, x÷=46÷, x=40; (83):x=:, x=×, x=, x÷=÷, x=; (84)=, 1.6x=6.4×2, 1.6x=12.8, 1.6x÷1.6=12.8÷1.6, x=8 (85)5(3x﹣4)﹣2(x﹣1)=5(2x﹣1) 15x﹣20﹣2x+2=10x﹣5,
44、 13x﹣18=10x﹣5, 13x﹣18﹣10x=10x﹣5﹣10x, 3x﹣18=﹣5, 3x﹣18+18=﹣5+18, 3x=13, 3x÷3=13÷3, x=; (86)=, 3(6x﹣1)=64, 18x﹣3=64, 18x﹣3+3=64+3, 18
45、x=67, 18x÷18=67÷18, x= (87)8(2X﹣7)=5(X+13), 16x﹣56=5x+65, 16x﹣56﹣5x=5x+65﹣5x, 11x﹣56=65, 11x﹣56+56=65+56, 11x=121, 11x÷11=121÷11, x=11, (88)3(x+4.5)=60, 3(x+4.5)÷3=60÷3, x+4.
46、5=20, x+4.5﹣4.5=20﹣4.5, x=15.5 (89)1.6x+2.4=7.52, 1.6x+2.4﹣2.4=7.52﹣2.4, 1.6x=5.12, 1.6x÷1.6=5.12÷1.6, x=3.2; (90)3(x﹣0.8)=6.3, 3x﹣2.4=6.3, 3x﹣2.4+2.4=6.3+2.4, 3x=8.7, 3x÷3=8.7÷3,
47、 x=2.9; (91)28.4﹣5x=5.8, 28.4﹣5x+5x=5.8+5x, 5.8+5x=28.4, 5.8+5x﹣5.8=28.4﹣5.8, 5x=22.6, 5x÷5=22.6÷5, x=4.52 (92) x:= 25x=×3, 25x=, 25x÷25=, x=; 授課:XXX (93)+2x=, +2x=, 2x=0, x=0; (94)x=15%, x
48、×x=15%x, 0.15x=0.15, 0.15x÷0.15=0.15÷0.15, x=1; (95)x﹣x=, x=, x=, x=. (96)x+50%x=6, 1.5x=6, 1.5x÷1.5=6÷1.5, x=4; (97):x=0.3:12, 0.3x=, 0.3x÷0.3=9÷0.3, x=30; (98)4x+2(8﹣x)=26, 4x+16﹣2x=26,
49、 2x+16=26, 2x+16﹣16=26﹣16, 2x÷2=10÷2, x=5 (99)x﹣=0, x﹣+=0+, x=, x×3=×3, x=; (100)+x=1, +x﹣=1﹣, x=, x×=×, x=1; (101)x×(+)=, x=, x×=×, x=. (102), , , 3x÷3=, x=; (103), , ,
50、 x=20; (104)x﹣, , , x=; (105)x×, x×, x= (106)5x+35=650, 授課:XXX 5x+35﹣35=650﹣35, 5x=615, 5x÷5=615÷5, x=123; (107)720÷3x=80, 720÷3x×3x=80×3x, 240x=720, 240x÷240=720÷240, x=3; (108)3.6x﹣0.9
51、x=8.1, (3.6﹣0.9)x=8.1, 2.7x=8.1, 2.7x÷2.7=8.1÷2.7, x=3; (109)4×4.5﹣3x=6, 18﹣3x=6, 18﹣3x+3x=6+3x, 6+3x=18, 6+3x﹣6=18﹣6, 3x=12, 3x÷3=12÷3, x=4 (110)=, 2.5x=10×0.8, 2.5x÷2.5=8÷2.
52、5, x=3.2; (111)6×3﹣1.8X=7.2, 18﹣1.8X=7.2, 18﹣1.8X+1.8X=7.2+1.8X, 7.2+1.8X=18, 7.2+1.8X﹣7.2=18﹣7.2, 1.8X=10.8, 1.8X÷1.8=10.8÷1.8, X=6 (112)÷x=, x=÷, x=; (113)x÷=42, x=42×, x
53、=9; (114)x+=, x+﹣=﹣, x=, x÷=÷, x= (115)7x÷3=8.19, 7x÷3×3=8.19×3, 7x=24.57, 7x÷7=24.57÷7, x=3.51; (116)12:0.6=x:, 0.6x=12×, 0.6x=6, 0.6x÷0.6=6÷0.6, x=10; (117)3(x+2)=4(x+1), 3x+6=4x+4,
54、 3x+6﹣3x=4x+4﹣3x, x+4=6, x+4﹣4=6﹣4, x=2 (118)3x﹣70%x=9.2, 3x﹣0.7x=9.2, 2.3x=9.2, 2.3x÷2.3=9.2÷2.3, x=4; (119) 6+x=240, 6+x﹣6=240﹣6, x=234, x÷=234÷, x=390 (120)22.5﹣0.4x=12.5, 22.5﹣0.4x+0.4x=12.5+0.4x,
55、 12.5+0.4x=22.5, 授課:XXX 12.5+0.4x﹣12.5=22.5﹣12.5, 0.4x÷0.4=10÷0.4, x=25; (121)x:3.5=4:2, 2x=3.5×4, 2x÷2=14÷2, x=6 (122)x﹣0.8x﹣6=16, 0.2x﹣6=16, 0.2x﹣6+6=16+6, 0.2x÷0.2=22÷0.2, x=110; (12
56、3):=x:8, x=8×, x×=8××, x=4; (124), 0.06x=2×0.015, 0.06x÷0.06=0.03÷0.06, x=0.5; (125)x:15=:, x=15×, x×6=15××6, x=40; (126)x+x=, x=, x×=×, x=; (127)x×50%﹣x=5, x=5, x×6=5×6, x=30; (128)1﹣x=, 1﹣x+x=
57、+x, +x=1, +x﹣=1﹣, x×=×, x=; (129)2.5+1x=3, 2.5+1x﹣2.5=3﹣2.5, x=, x×=×, x= (130)3x﹣2=4, 3x﹣2+2=4+2, 3x=6, 3x÷3=6÷3, x=; (131)8.5﹣3x=2, 8.5﹣3x+3x=2+3x, 3x+2=8.5, 3x+2﹣2=8.5﹣2, 3x=6, 3x÷3=6÷3,
58、 x=2; (132)3÷x=4, 3÷x×x=4×x, 授課:XXX 4x=3, 4x÷4=3÷4, x= (133)x﹣5%=17.54, 解:x﹣5%+5%=17.54+5%, x=17.59, x=23; (134):=:(4﹣x), 解:4x=, 2﹣x+x=x, 2﹣+x, =x, x=3 (135) 6x+31=49, 6x+31﹣31=49﹣31, 6x
59、=18, 6x÷6=18÷6, x=3; (136) 7x÷3=8.19, 7x÷3×3=8.19×3, 7x=24.57, 7x÷7=24.57÷7, x=3.51; (137) 32.8﹣9x=17.5, 32.8﹣9x+9x=17.5+9x, 17.5+9x=32.8, 17.5+9x﹣17.5=32.8﹣17.5, 9x=15.3, 9x÷9=15.3÷9, x=1.7; (138) x﹣0.36x=16, (1﹣0
60、.36)x=16, 0.64x=16, 0.64x÷0.64=16÷0.64, x=25; (139) 6×7+3x=69, 42+3x=69, 42+3x﹣42=69﹣42, 3x=27, 3x÷3=27÷3, x=9; (140) 6x+2x﹣56=0, (6+2)x﹣56+56=0+56, 8x=56, 8x÷8=56÷8, x=7 (141) 3x﹣0.45×4=2.7, 3x﹣1.
61、8=2.7, 3x﹣1.8+1.8=2.7+1.8, 3x=4.5, 3x÷3=4.5÷3, x=1.5; (142) 5.8x﹣4.6x=0.96, 1.2x=0.96, 1.2x÷1.2=0.96÷1.2, x=0.8; (143) 8.4÷(9﹣x)=3, 9﹣x=8.4÷3, 9﹣x=2.8, x=9﹣2.8, x=6.2; (144) 3x÷1.2=8,
62、 3x÷1.2×1.2=8×1.2, 3x=9.6, 3x÷3=9.6÷3, x=3.2 (145)5x+28=71, 5x+28﹣28=71﹣28, 5x=43, 5x÷5=43÷5, x=8.6; (146)8.7﹣1.2x=3.9, 8.7﹣1.2x+1.2x﹣3.9=3.9+1.2x﹣3.9, 4.8=1.2x, 1.2x=4.8, 1.2x÷1.2
63、=4.8÷1.2, x=4; (147)8x﹣2.6x=37.8, 5.4x=37.8, 5.4x÷5.4=37.8÷5.4, x=7; (148)0.75x﹣0.95×4=8.5, 0.75x﹣3.8=8.5, 授課:XXX 0.75x﹣3.8+3.8=8.5+3.8, 0.75x=12.3, 0.75x÷0.75=12.3÷0.75, x=16.4,; (149)54÷2+3x=7
64、2, 27+3x=72, 27+3x﹣27=72﹣27, 3x=45, 3x÷3=45÷3, x=15; (150)8x﹣2.6=37.8, 8x﹣2.6+2.6=37.8+2.6, 8x=40.4, 8x÷8=40.4÷8, x=5.05 (151)x÷=, x÷×=×, x=, x×4=×4, x=; (152)x+30%x=26, (1+30%)x=26, 1.3x=26, 1.
65、3x÷1.3=26÷1.3, x=20; (153) 7.8﹣3x=3.6, 7.8﹣3x+3x=3.6+3x, 3.6+3x=7.8, 3.6+3x﹣3.6=7.8﹣3.6, 3x=4.2, 3x÷3=4.2÷3, x=1.4 (154) 6×3﹣1.8x=7.2, 18﹣1.8x=7.2, 18﹣1.8x+1.8x=7.2+1.8x, 18=7.2+1.8x, 18﹣7.2=7.2+1.8
66、x﹣7.2, 10.8=1.8x, 10.8÷1.8=1.8x÷1.8, x=6; (155)10:x=4.5:0.8, 4.5x=10×0.8, 4.5x=8, 4.5x÷4.5=8÷4.5, x=; (156):=x:, x=×, x=, x÷=÷, x= (157)X﹣7.65=4.64, X﹣7.65+8.67=4.64+7.65, X=12.29; (158)28.25﹣X=8.25, 28.25﹣X+X=8.25+X, X+8.25=28.25, X+8.25﹣8.25=28.25﹣8.25, X=20; (159)X﹣(3.6+2.97)=12.42, X﹣6.57=12.42, X﹣6.57+6.57=12.42+6.57,
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