(x+y)/6+(x-y)/10=1,(x+y)/6-(x-y)/10=5

(X+Y)/6+(X-Y)/10=3 (X+Y)/6-(X-Y)/10=-12(X-Y)/10=2(X+Y)/6=-1 合并同类项(X-Y)/5=(X+Y)/3=-1 化简3（X-Y）=5(X+Y)=-153X-3Y=5X+5Y2X=-8Y X=-4Y3×（-5Y）=-15∴Y=-1 X=4肯定正确,你可以验证,