题目内容
口算
3×9= |
19+67= |
6×7= |
8× |
5×7= |
96-60= |
7×4= |
27+ |
6×8= |
42-6= |
28+3= |
56+ |
8×9= |
25+70= |
48+6= |
77- |
3×8= |
3×6= |
分析:根据整数加减乘除法的计算方法进行解答即可.
解答:解:
故答案为:27,86,42,3,35,36,28,66,48,36,31,9,72,75,54,20,24,18,40.
3×9=27 | 19+67=86 | 6×7=42 | 8×3=24 | 5×7=35 |
96-60=36 | 7×4=28 | 27+66=93 | 6×8=48 | 42-6=36 |
28+3=31 | 56+9=65 | 8×9=72 | 25+70=75 | 48+6=54 |
77-20=57 | 3×8=24 | 3×6=18 | 40-13=27. |
点评:此题可怜虫整数加减乘除法的口算能力,注意加法和加法互为逆运算,乘法和除法互为逆运算.
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