4x-3y=3 3x+2y=15
已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.
已知x和y满足x+3y+|3x-y|=19,2x+y=6,求x,y的值
已知2x-y/x+3y=2,求代数式﹙4x-2y/x+3y﹚-﹙4x+12y/2x-y﹚的值
4X-3y=15.3X+2y=7.求X与y
先化简,再求值:【(X+2Y)(X-2Y)-(X+4Y)平方]除4Y,其中X=-2,Y=-3
(x+3y-4)(2x-y)
x/x-y*y^2/x+y-x^3y2/x^4-y^4/x^2/x^2+y^2
(2/3x-2/x+y(x+y/3x-x-y))÷x-y/x,其中5x+3y=0
解方程组2x+y=6,4x-3y=2
x²+y²-4x+6y+13=0,求(3x+y)²-3(3x+y)(x+y)-(x-3y)
已知X^2-4Y^2=-15,X+2Y=3,求X,Y的值
(2x+y)(2x-3y)+x(2y+y) 2a(x-y)-4b(x-y)