9.9*5.5+0.55怎么简算

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9.9*5.5+0.55怎么简算
9.9*5.5+0.55怎么简算

9.9*5.5+0.55怎么简算
9.9*5.5+0.55
=9.9*5.5+5.5*0.1
=(9.9+0.1)*5.5
=10*5.5
=55

9.9*5.5+0.55
=9.9*5.5+5.5*0.1
=(9.9+0.1)*5.5
=10*5.5
=55

0.55=0.1*5.5
9.9*5.5+0.55=9.9*5.5+0.1*5.5=（9.9+0.1）*5.5=10*5.5=55

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