解方程组：7x+11y=0,3x-y=24

解方程组：7x+11y=0,3x-y=24 解方程组24/(x+y) +24/(x-y) = 7/3 ,8/(x+y) +18/(x-y) = 4/3 解方程组（三分之x+y）+y=6,3(x+y)-y=24 解方程组x+y/3=x-y/4 2x+3y=11 y-3x=2,y-5x=4,y-7x=6,y-9x=8,y-11x=0方程组, 解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7 解方程组 {3(x+y)-4(x-y)=11 {2(x-y)+5(x+y)=27全过程、快 解方程组 {3(x+y)-4(x-y)=11 {2(x-y)+5(x+y)=27 解二元一次方程组:{5(x+y)+3(x-y)=2{7(x+y)-3(x-y)=-6 2(x+y)-3(x-y)=1 6(x+y)+7(x-y)=51 解方程组 解方程组﹛2(x+y)-3(x-y)=1 6(x+y)+7(x-y)=51 解方程组（1）2x+3y=12 ,2x+y=0 (2)x+y=7,3（x+y）-7y=7