4.5×0.4+0.55×4简便运算

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4.5×0.4+0.55×4简便运算
4.5×0.4+0.55×4简便运算

4.5×0.4+0.55×4简便运算
4.5×0.4+0.55×4
=0.45×4+0.55×4
=4×(0.45+0.55)
=4×1
=4

4.5×0.4+0.55×4
=4.5×0.4+5.5×0.4
=（4.5+5.5）×0.4
=10×0.4
=4
祝你笑口

4.5×0.4+0.55×4=0.45×10×0.4+0.55×4=0.45×4+0.55×4=（0.45+0.55）×4=4

把0.4×10，变成0.45×4+0.55×4，再变成（0.55+0.45）×4

4.5×0.4+0.55×4
=4.5×0.4×1+0.55×0.4×10
=（4.5×1+0.55×10）×0.4
=（4.5+5.5）×0.4
=10×0.4
=4

=0.45×4+0.55×4
=(0.45+0.55)×4
=1×4
=4

=4×0.45+4×5.5
=4×（0.45+0.55）
=4

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