3.2X-1.5X=0.51、1.7X=0.51X=0.51÷1.7X=0.32X+1.2X5=72X=7-1.2×52X=1X=1÷2X=0.5检验X=0.5左边=2×0.5+1.2×5=1+6=7=右边所以x=0.5是方程的解
3.2X-1.5X=0.511.7X=0.51X=0.32X+1.2X5=72X+6=72X=1X=0.5