3.52乘0.79减0.173乘7.9加1.79乘0.21

问题描述:

3.52乘0.79减0.173乘7.9加1.79乘0.21

3.52x0.79-0.173x7.9+1.79x0.21=0.79x(3.52-1.73)+1.79x0.21=0.79x1.79+1.79x0.21=1.79x(0.79+0.21)=1.79x1=1.79