Question

12.5x8.75+1.3x7/8+2.2x0.875简便运算？

Answer 1

12.5*8.75+1.3*7/8+2.2*0.875
=12.5*8.75+1.3*0.875+2.2*0.875
乘法分配律简便运算
=0.875*（125+1.3+2.2）
=0.875*128.5
=7/8*（128+0.5）再次应用乘法分配律
=7/8*128+7/8*0.5
=112+7/16
=112又7/16

Answer 2

简便运算：
12.5×8.75+1.3×7/8+2.2×0.875
=1.25×0.875+1.3×0.875+2.2×0.875
=0.875×(1.25+1.3+2.2)
=0.875×4.75
=4.15625