用简便方法计算:314×0.043+3.14×7.2-31.4×0.15.

问题描述:

用简便方法计算:314×0.043+3.14×7.2-31.4×0.15.

314×0.043+3.14×7.2-31.4×0.15,
=31.4×0.43+31.4×0.72-31.4×0.15,
=31.4×(0.43+0.72-0.15),
=31.4×1,
=31.4.
答案解析:根据数字特点,把原式变为31.4×0.43+31.4×0.72-31.4×0.15,根据乘法分配律简算.
考试点:运算定律与简便运算.
知识点:此题解答的关键是进行数字转化,运用运算定律,进行简便计算.