解方程组73x-7y=66 18x+98y=25

解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7 解方程组:2/(x+y)+5/(x-y)=18 9/(x+y)-10/(y-x)=66 解方程组：2/(x+y)+5/(x-y)=18 9/(x+y)-10/(y-x)=66 解方程组24/(x+y) +24/(x-y) = 7/3 ,8/(x+y) +18/(x-y) = 4/3 解方程组 x+y+z=-7 x-y=12 x+y-z=6 阅读下面方程组的解法:解方程组{x/5=y/7,x+y=-36 解方程组{x(x+y+z)=6,y(x+y+z)=12,z(x+y+z)=18 2(x+y)-3(x-y)=1 6(x+y)+7(x-y)=51 解方程组 解二元一次方程组:{5(x+y)+3(x-y)=2{7(x+y)-3(x-y)=-6 解方程组﹛2(x+y)-3(x-y)=1 6(x+y)+7(x-y)=51 解方程组 3x+4y=18,7x-5y=30 解方程组4x+5y=51 6x-7y=-25