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1、 練習2
32+6=????????? 29-7=??????????? 35+2=????????? 73+4=?????? 25+4=
43+5=????????? 87+10=????????? 39-3=????????? 48-30=????????95-40=
81-2=????????? 60+8=??????????? 39+10=???????? 76+10=?????? 70+30=
48-9=???????? 47-8=??????????? 52-4=??????????43-8=?????
2、?? 68-9=
40-2=???????? 27-9=??????????? 32-4=??????????41-2=??????? 38-9=
30-2=???????? 72-2=??????????? 66-4=????????? 39-2=????? 20-9=
53+5=????????? 35+2=????????????39-4=????????? 8+50=?????? 20-1=
40+6=??????????62+7=??????????? 89-5=????????? 63+3=????? 34-2=
6+2+54=? 50+46
3、-2=? 7+56-20=? 13+15+4= 11+56-10=? 6+42+29=? 43-43+5=? 36-16+22= 50-16+18=? 2+13+23=? 59+10-9=? 34+20-18= 2+27+41=? 3+43-30=? 19+64-6=? 54+26+12= 36+(5+25)=? 4+20+48=? 47+31-10=? 99-2
4、1-32=?
18-2=?????????? 30+8=?????????? 43+1=????????? 86+2=????? 70+3=
30-2=???????? 72-2=???????????66-4=???????? 39-2=????? 20-9= 53+5=????????? 35+2=???????????39-4=???????? 8+50=??????20-1=
16+9=???????? 5+18=?????? 17+3=???????? 36+6=????????29+5=???? 87+
5、9= 48+8=??????? 35+8=??????? 4+19=????????7+26=??? ?? 4+37=???????? 29+4= 19+8=???????? 29+7=??????? 7+38=??? ? 9+18=???????? 40+6=???????? 35+30= 62+8=????????75+5=???? 23+7=???????? 26+8=??????? ?19+60=????????
6、 32+8= 16+9=???? 24+6=??????? 5+37=??????? ?44+7=??????? ?67+9=????????50+8= 61+9=??????? 85+4=??????? 91+8=???????? 82+5=????????39+1=????? 46+7= 23+7=?????? 37+4=???????? 78+3=????????27+6=????? 39+8=?????????
7、 68+5= 9+25=??????? 85+6=????????92+4=??? ?? 86+2=??????? ? 48+7=?? ??????? 39+9= 2+38=???????? 56+8=???? 36+5=???????? 35+6=???????? 46+9=????????? 9+25= 23+8=???? 46+6=??????? 90+9=??????? 84+7=???????? ? 34+7=??????
8、??? 56+3=
12+9=??????? 93+3=?????? 58+3=????????? 75+7=????????? 35+6=????? ? 86+8= 39+2=?????? 27+4=??????? 50+5=????????? 34+9=??? ?? 10+60=???????? 9+50= 10+40=????? 61+10=???? 18+5=????? 74+6=????????? 37+2=????????? 26
9、+5= 23+7=?????? 47+4=??????? 88+3=????????? 47+6=????? 39+8=???????? ? 68+5= 26+8=??????? 72-17-37=? 95-71-11=? 96-33-53=? 74-12-11= 68-7-32=? 97-7-25=? 89-59-27=? 33-9-12= 79-19-38=? 68-8-37=? 9
10、7-60-19=? 58-6-19= 97-15-63=? 81-16-3=? 95-6-62=?
?????
82+5=????????? 39+10=????? 46+7= 73+7=????? ? 37+4=?????? ?? 78+3=????????? 27+60=????? 39+8=????????? 68+5= 9+25=????? ? ? 35+6=???????? 2+40=????? 86+2=??
11、??????? 48+7=????????? 39+10=
16+9=???????? 5+18=?????? 17+3=???????? 36+6=??????????? 29+5=???? 87+9= 48+8=??????? 35+8=??????? 4+19=???????? 7+26=?????? ? 4+37=???????? 29+4= 39+8=???????? 26+7=???????? 7+38=? 23+(41+9)=?
12、 36+(27+3)=? 25+(29+7)=? 30+23+31=
55+6+10=? 49+20+11=? 56-(12+8)=? 2+22-16=
35+40+1=? 52+7+1=? 13+6+10=? 12+13+31=
66+7+15=? 3+59-16=? 36-5+9=? 14+(37+3)=
11+6+16=? 7+52+7=? 57+5+11=? 80+4+1=