85.42x7903.29-286.5x790.329+79032.9x4.323=?要次提取公因数,要简便计算.

问题描述:

85.42x7903.29-286.5x790.329+79032.9x4.323=?要次提取公因数,要简便计算.

85.42x7903.29-286.5x790.329+79032.9x4.323
=85.42x7903.29-28.65x7903.29+7903.29x43.23
=7903.29x(85.42-28.65+43.23)
=7903.29x100
=790329