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8.4÷0.4=3.2×25=数学公式=数学公式×25=
3+5÷6=18×(数学公式+数学公式)=数学公式×数学公式÷数学公式×数学公式=0.8×138+62×数学公式=

8.4÷0.4=21,3.2×25=80,=9,×25=
3+5÷6=318×(+)=27,×÷×=0.8×138+62×=160.

分析:3.2×25先把3.2分解成8×0.4,然后运用乘法结合律简算;3+5÷6先算除法,再算加法;18×(+)运用乘法分配律简算;×÷×先把除法变成乘法,再运用乘法结合律简算;0.8×138+62×运用乘法分配律简算.
点评:本题考查了基本的计算,要注意分析式中数据,运用合适的简便方法计算.
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