45×5.5×0.42怎么简便?
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发布时间:2024-09-25 19:03
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热心网友
时间:2024-09-25 21:19
45×5.5×0.42
=(90÷2)×(11÷2)×0.42
=9×10×11×0.42÷2÷2
=9×11×(10×0.42÷2)÷2
=99×(2.1÷2)
=(100-1)×1.05
=105-1.05
=103.95
望采纳,谢谢
热心网友
时间:2024-09-25 21:19
45×5.5×0.42
=45×2×5.5×0.21
=90×5.5×0.21
=9×5.5×2.1
=9×(11+0.55)
=99+4.95
=103.95