(0.2x-0.1)/0.3-(0.01x+0.02)/0.05=0.1x两边先除 0.1(2x-1)/0.3-(0.1x+0.2)/0.05=x再对(0.1x+0.2)/0.05 上下乘20,即 (2x+4)那么 (2x-1)/0.3-(2x+4)=x两边乘0.3 (2x-1)-0.3(2x+4)=0.3x2x-1-0.6x-1.2=0.3x(2-0.6-0.3)x=1+1.21.1x=2.2x=2.2/1.1=2