17.5÷12.5×1.4=（17.5×4）÷（12.5×4）×1.4=70÷50×1.4=1.4×1.4=1.96
1.4×1.4
1×1=1
0.4+0.4=0.8
0.4×0.4=0.16
1+0.8+0.16=1.96