3(X+Y)-5(X-Y)=16
2(x+y)-(X-Y)=15
8y-2x=16
x+3y=15
8y-2x=16
2x+6y=30
14y=16+30=46
y=23/7
x=15-3y=15-3*23/7=36/7
x=36/7
y=23/7对不起 对不起我把题抄错了2(x+y)+(X-Y)=15…………②现在看看能解么解对了我追加分给你 拜托了3(X+Y)-5(X-Y)=16 2(x+y)+(X-Y)=15 8y-2x=163x+2y=15 8y-2x=1612x+8y=60 14x=44x=22/7 2y=15-3x=15-3*22/7=39/7y=39/14