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1.
口算。
40+30= | 5+23= | 55+5= | 18-9= | 26-4= |
37+6= | 53-7= | 72-5= | 34+8+50= | 73+20-3= |
47-(18-9)= | 45-7-3= | 25+(15-8)= | 100-50+7= | |
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2.
我会计算
19-4= | 67-7= | 5+50= | 88-8= |
18-9= | 70+8= | 87-80= | 49-40= |
13-6= | 56-50= | 60+7= | 4+30= |
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3.
口算。
23-5= | 37+6= | 86-50= | 5+50= |
72-5= | 31+5= | 77-8= | 63+30= |
7+54= | 15+50= | 35-7= | 6+33= |
100-40= | 8+48= | 96-90= | |