解方程组x-2y=-5 5x+2y=11

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 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)+2(x-y)=11,6(x+y)-5(x-y)=13. 解方程组:x+y=2x+y+1=5x+2y+1 解方程组3x+5(x+y)=2 3y-2(x+y)=4 x+y+xy=5 (x^2)y+x(y^2)=6 解方程组 解方程组3分之x-y=2分之 x+y解方程组3分之x-y=2分之 x+y；2x-5y=7 解方程组 x+y/5+x-y/2=7 4(x+y)-5(x-y)=2 解分式方程组x+y/3-3/x-y=2 x+y/5+2/x-y=5 解方程组 X+Y/2+X-Y/3=6 4[X+Y]-5[X-Y]=2 解二元一次方程组{x+y/2+x-y/3=6,4(x+y)-2=5(x-y) 解方程组2分之x+y+3分之x-y=6 4(x+y)-5(x-y)=2 解方程组 {(x+y)/2+(x-y)/3=6 5(x+y)-2(x-y)=4 解方程组x+y/2+x-y/2=7,4(x+y)-5(x-y)=2... 3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 解方程组 解方程组 3(x+y)-2(x-y)=9,5(x+y)+2(x-y)=-1 解方程组 (x+y)^2-3(x+y)=54 (x-y)^2-5(x-y)=14