4.9乘以9.9加0.49怎样简便计算

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4.9乘以9.9加0.49怎样简便计算
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4.9乘以9.9加0.49怎样简便计算
4.9乘以9.9加0.49怎样简便计算

4.9乘以9.9加0.49怎样简便计算
4.9乘以9.9加0.49
=4.9×9.9+0.49
=4.9×9.9+4.9×0.1
=4.9×（9.9+0.1）
=4.9×10
=49

4.9乘以9.9加0.49
=4.9x9.9+4.9x0.1
=4.9x(9.9+0.1)
=4.9x10
=49

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考虑下

4.9*9.9+0.49
=4.9*9.9+4.9*0.1
=4.9*(9.9+0.1)
=4.9*10
=49

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