解方程组：2x+y=4,x+2y=5,

解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7 解方程组3x+5(x+y)=2 3y-2(x+y)=4 解方程组 x+y/5+x-y/2=7 4(x+y)-5(x-y)=2 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)-4(x-y)=11 {2(x-y)+5(x+y)=27 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 {3(x+y)-4(x-y)=11 {2(x-y)+5(x+y)=27全过程、快 解方程组：x+y/2+x-y/3=6 4(x+y)-5(x-y)=12 解方程组8y+5x=84y-3x=7 方程组 因式分解 4x^3-4x^2y-(x-y) 1/2x-2y=-74,x-6y=-12解方程组,x／5-y／2=2,2x+3y=4解方程组 解方程组 3x-5y=7 4x+2y=5解方程组3x-5y=74x+2y=5 解方程组 2x+y=3,x+2y=-6解方程组 x+5y=4,3x-6y=5 解方程组3x+4y.x-2y=5解方程组3x=4y。x-2y=5