方程组x^2+y^2+y=-2和3y^2+7y+2x=-3 求x,y
已知方程组2X+Y=6和X-3Y=1不解方程组,求7Y(X-3Y)^2-(3Y-X)^3
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.
求x+y/3+x-y/2=6 3(x+y)-2(x-y)=28方程组的解
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
解方程组3(x+y)-4(x-y)=4和(x+y)/2+(x-y)/6=1
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
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x:y=2:3和5x+3y=38 3y+x/y=8和9y-2x/y=9
方程组{x/2+y/3=4,{2(x-y)+7=3(x-3).求x、y
关于x,y的方程组x+2y=7k 3x-5y=-k的解x,y的和对于5求k值
解二元一次方程组:{5(x+y)+3(x-y)=2{7(x+y)-3(x-y)=-6