解小列方程组:x-y=3,2y+2(x-y)=11
解方程组x+y/3=x-y/4 2x+3y=11
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
用代入法解方程组 {x-y=3 2y+3(x-y)=11}
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
不解方程组2x-y=12 x+2y=11求(2x-y)^3-(2x-y)^2(x-3y)的值
已知方程组2x-y=10,x+2y=11,求(2x-y)³-(2x-y)²(x-3y)的值
y-3x=2,y-5x=4,y-7x=6,y-9x=8,y-11x=0方程组,
方程组x-2y=8,3x-4y=5,x=?,y=?
解方程组X+Y/2=3X-2Y=10+6X+Y/4
解方程组{ 3x-4y(x-y)=3 { 2x-3y=1
如果方程组3x+y=k x+3y=2的解x,y