题目内容
3.75×31+62.5×3.1=
310
310
.分析:通过观察,此题先运用积不变的规律,先把原式变为3.75×31+6.25×31,再根据乘法分配律的逆运算简算.
解答:解:3.75×31+62.5×3.1,
=3.75×31+6.25×31,
=(3.75+6.25)×31,
=10×31,
=310.
故答案为:310.
=3.75×31+6.25×31,
=(3.75+6.25)×31,
=10×31,
=310.
故答案为:310.
点评:此题运用了积不变的规律与乘法分配律进行简算.
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