Question

解方程组：x+y/2+x-y/3=6 4(x+y)-5(x-y)=2

按普通解法解出来的答案不会对的哦，正确答案为x=7 y=1要动脑哦

Answer 1

（X+Y)/2+(X-Y)/3=6方程两边同乘以6得3(X+Y)+2(X-Y)=36化简得5x+y=36
4(x+y)-5(x-y)=2化简得9y-x=2解方程组5x+y=36,9y-x=2得x=7y=1

Answer 2

你错了！把x=7 y=1代入4(x+y)-5(x-y)=2 28-30= - 2