2x-5y=1 2y-5x=8怎么解
X+Y=5.7 1/4X+2/5Y=4/5X 怎么解
先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
2x-y=8 3x+2y=5与3x+2y=1 3x-4y=-11用加减法怎么算?
解方程组:1、6(x-y)-2(x-y)=14 2、3(x-y)+(x+y)+5 怎么解
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
解方程组{(x-2)(y+3)=(x+1)(y-1) {(x+1)(y+1)=(x-1)(y+5)
已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(
分式的加减:[(x/y-y/x)除以(x+y)+x(1/y-1/x)]除以1+x/y,其中x=5,y=2
已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y
怎么解方程组2x-3y=8 5x-7y=5