7.85×99+78.5×0.1简便计算.
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7.85×99+78.5×0.1简便计算.7.85×99+78.5×0.1简便计算.7.85×99+78.5×0.1简便计算.7.85×99+78.5×0.1=78.5x9.9+78.5x0.1=78
7.85×99+78.5×0.1简便计算.
7.85×99+78.5×0.1简便计算.
7.85×99+78.5×0.1简便计算.
7.85×99+78.5×0.1
=78.5x9.9+78.5x0.1
=78.5x(9.9+0.1)
=78.5x10
=785
换算成78,5×!9,9+0,1!
7.85*99+78.5*0.1=
7.85*99+7.85*1=
7.85*100=
785
=7·85X(99十1)=785
7.85×100
7.85×99+7.85×1
785!
用乘法分配律,原式=7.85×99+7.85×1=7.85×(99+1)=7.85×100=785,关键在于要把78.5×0.1化成7.85×1
78.5×9.9+78.5×0.1=78.5×(9.9+0.1)=78.5×10=785
=7.85×100-7.85+78.5×1÷10
=785-7.85+7,85
=785