9.1乘以4.8有巧算吗?
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=(9+0.1)×4.8
=9×4.8+0.1×4.8
=(10-1)×4.8+0.48
=10×4.8-1×4.8+0.48
=48-4.8+0.48
= 43.68
=9×4.8+0.1×4.8
=(10-1)×4.8+0.48
=10×4.8-1×4.8+0.48
=48-4.8+0.48
= 43.68
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9.1×4.8=(9+0.1)×(5-0.2)=45-1.8+0.5-0.02=45-1.3-0.02=43.7-0.02=43.68
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展开全部
9.1×4.8
=(10-0.9)×4.8
=10×4.8-0.9×4.8
=48-4.8+0.1×4.8
=48-5+0.2+0.48
=43.2+0.48
=43.68
=(10-0.9)×4.8
=10×4.8-0.9×4.8
=48-4.8+0.1×4.8
=48-5+0.2+0.48
=43.2+0.48
=43.68
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展开全部
9.1×4.8
=(10-0.9)×4.8
=10×4.8-(1-0.1)×4.8
=48-(1×4.8-0.8×4.8)
=48-(4.8-0.48)
=48-4.8+0.48
=48.48-(5-0.2)
=48.48-5+0.2
=43.48+0.2
=43.68
=(10-0.9)×4.8
=10×4.8-(1-0.1)×4.8
=48-(1×4.8-0.8×4.8)
=48-(4.8-0.48)
=48-4.8+0.48
=48.48-(5-0.2)
=48.48-5+0.2
=43.48+0.2
=43.68
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