Question

4又1/2×40%+6.5*2/5-0.4简便运算

Answer 1

原式

=4.5×0.4+6.5×0.4-0.4

=（4.5+6.5-1）×0.4

=10×0.4

=4

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Answer 2

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