9.1乘以4.8有巧算吗?
114个回答
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9.1×4.8
=(10-0.9)×4.8
=10×4.8-0.9×4.8
=48-0.9×(5-0.2)
=48-0.9×5+0.9×0.2
=48-4.5+0.18
=43.5+0.18
=43.68
=(10-0.9)×4.8
=10×4.8-0.9×4.8
=48-0.9×(5-0.2)
=48-0.9×5+0.9×0.2
=48-4.5+0.18
=43.5+0.18
=43.68
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利用乘法分配律
9.1×4.8
=9.1×(5-0.2)
=9.1×5-9.1×0.2
=45.5-1.82
=43.68
9.1×4.8
=9.1×(5-0.2)
=9.1×5-9.1×0.2
=45.5-1.82
=43.68
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9.1×4.8
=(10-1+0.1)×4.8
=10×4.8-4.8+0.1×4.8
=48-4.8+0.48
=43.2+0.48
=43.68
=(10-1+0.1)×4.8
=10×4.8-4.8+0.1×4.8
=48-4.8+0.48
=43.2+0.48
=43.68
追答
9.1×4.8
=(10-1+0.1)×4.8
=10×4.8-4.8+0.1×4.8
=48-4.8+0.48
=43.2+0.48
=43.68
9.1×4.8
=(10-1+0.1)×4.8
=10×4.8-4.8+0.1×4.8
=48-4.8+0.48
=43.2+0.48
=43.68
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9.1x4.8
=9.1x(5-0.2)
=45.5-1.82
=43.68
=9.1x(5-0.2)
=45.5-1.82
=43.68
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9.1×4.8
=(10-1+0.1)×4.8
=48-4.8+0.48
=43.2+0.48
=43.68
=(10-1+0.1)×4.8
=48-4.8+0.48
=43.2+0.48
=43.68
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评论
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