(x一9)÷0.2=1.6X一9=1.6*0.2X=9+1.6*0.2=9.32
两边同乘以0.2 x-9 = 1.6 X 0.2 = 0.32 两边同时加9 x = 0.32+9 = 9.32
（x-9）x 5 = 1.6
解： (x一9)÷0.2*5=1.6*5(x一9)=8x一9+9=8+9x=17
