77.7*99+111*0.7怎样简便计算

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77.7*99+111*0.7怎样简便计算
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77.7*99+111*0.7怎样简便计算
77.7*99+111*0.7怎样简便计算

77.7*99+111*0.7怎样简便计算
77.7*99+111*0.7
=777*0.1*99+111*7*0.1
=777*9.9+777*0.1
=77*(9.9+0.1)
=777*10
=7770

77.7*99+111*0.7
=77.7*99+77.7*1
=77.7*(99+1)
=77.7*100
=7770

77.7×99+111×0.7
=777×0.1×99+111×7×0.1
=777×9.9+777×0.1
=77×(9.9+0.1)
=777×10
=7770

原式=77.7*(100-1)+77.7=77.7*100-77.7+77.7=7770