这道数学题怎样简便计算66.6*7.23+99.9*5.18

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这道数学题怎样简便计算66.6*7.23+99.9*5.18
这道数学题怎样简便计算
66.6*7.23+99.9*5.18

这道数学题怎样简便计算66.6*7.23+99.9*5.18
11.1*(6*7.23)+11.1*(9*5.18)
11.1*(43.38+46.62)
11.1*90
999

66.6*7.23+99.9*5.18
=33.3*2*7.23+33.3*3*5.18
=33.3*(14.46+15.54)
=33.3*30
=999

33.3*2*7.23+33.3*3*5.18
=33.3*(2*7.23+3*5.18)
=33.3*(14.46+15.54)
=33.3*30
=999