解方程组 x-3y=3 (x+2)²-(y-3)²=(x+y)(x-y)-2
已知x,y的值满足方程组x+2y=3,x-y=-2,求x/(x-y)²+x²-y²/(x+
解方程组 y²-3x²+x+1=0 2x-y=1
已知方程组{2x+y=6,x-3y=1,不解方程组,求7y(x-3y)²-(3y-x)²的值.
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
解方程组:{x+|3x-y|+3y=15 2x+y=6
解方程组x+y/3=x-y/4 2x+3y=11
解方程组X+Y/2=3X-2Y=10+6X+Y/4
用代入法解方程组:y=3(x-y),x=2(x-y)
解方程组:(x+3)(y-2)=(x-3)(y+10),(x+1)(y+3)=(x-2)(y+12)
解方程组:2(x+y)-3(x-y)=34(x+y)+3x=15+3y.
已知方程组2x-y=10,x+2y=11,求(2x-y)³-(2x-y)²(x-3y)的值