3.5*5/4+12.5*13/20简便计算

问题描述:

3.5*5/4+12.5*13/20简便计算

3.5*5/4+12.5*13/20=3.5X1.25+1.25X10X0.65=1.25X(3.5+6.5)=12.5

3.5*5/4+12.5*13/20
=3.5x1.25+12.5x0.65
=3.5x1.25+6.5x1.25
=(3.5+6.5)x1.25
=10x1.25
=12.5