25%乘以8.3加二分之五乘0.17=1/4*(83/10)+10/4*(17/100)=1/4*(83/10+10*17/100)=1/4*(83/10+17/10)=1/4*10=2.5
25%乘以8.3加二分之五乘0.17=25%×8.3+5/2×0.17=0.25×8.3+2.5×0.17=0.25×8.3+2.5÷10×10×0.17=0.25×8.3+0.25×1.7=0.25×(8.3+1.7)=0.25×10=2.5
先给好评接着答