题目内容
7.用简便方法计算.125×8.08-125×7.08
(0.08+4.4)×0.125
5.37-(1.37+2.86)
3.8×6.47+6.2×6,47.
分析 (1)(2)(4)运用乘法分配律简算;
(3)运用减法的性质简算.
解答 解:(1)125×8.08-125×7.08
=125×(8.08-7.08)
=125×1
=125
(2)(0.08+4.4)×0.125
=0.08×0.125+4.4×0.125
=0.01+0.55
=0.56
(3)5.37-(1.37+2.86)
=5.37-1.37-2.86
=(5.37-1.37)-2.86
=4-2.86
=1.14
(4)3.8×6.47+6.2×6.47
=(3.8+6.2)×6.47
=10×6.47
=64.7
点评 根据数据特点,灵活运用所学的运算定律或运算性质简便计算.
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