4又1/2×40%+6.5*2/5-0.4简便运算

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4又1/2×40%+6.5*2/5-0.4简便运算
4又1/2×40%+6.5*2/5-0.4简便运算

4又1/2×40%+6.5*2/5-0.4简便运算
原式
=4.5×0.4+6.5×0.4-0.4
=（4.5+6.5-1）×0.4
=10×0.4
=4