方程组：{2x-y+5=0,2x+4y=10.

解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7 方程组x-2y=8,3x-4y=5,x=?,y=? y-3x=2,y-5x=4,y-7x=6,y-9x=8,y-11x=0方程组, 解方程组x^2-y^2=x+y 4x^2-y^2+2x-y=0过程 x+y/2+x-y/3=6,4(x+y)-5(x-y)=2用加减消元法解方程组 3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 解方程组 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/3=6 4[X+Y]-5[X-Y]=2 解方程组:{二分之x+y+二分之x-y=6,4(x+y)-5(x-y)=2() 解方程组：x+y/2+x-y/3=6 4(x+y)-5(x-y)=12 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