5/1x+3/1y=5/2两边乘以15得3x+5y=6............(1)0.5x-0.3y=0.2两边乘以10得5x-3y=2............(2)(1)*3+(2)*5得34x=28x=14/17代入(2)得70/17-3y=23y=36/17y=12/17解得x=14/17y=12/17
