x+8y=15 4x+y=29
已知2x+2y=-8,4x+y=15求(x-y)^-(3x+2y)^
[(x+2y)(x-2y)-(x-2y)^2+8y(x+y)]除以4x=
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai
解方程组(1/X+Y)-(1/Y-X)=8/15,(5/X+Y)-5/Y=4
9y=3x-(x-1),4(x+y)-(2x+4)=8y
第一道:已知X的平方+Y的平方-4X+10Y+29=0.求分式X+Y/X-Y+X-Y/X+Y的值.
已知实数x.y满足根号(x+y-8)+根号(8-x-y)=根号(3x-y-4)+根号(x-2y+7),求x,y
已知x的平方+y的平方-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知x.x+y.y+8x+6y+25=0,求代数式(x.x-4y.y)/(x.x+4xy+4y.y)-x/(x+2y)的
X+Y=158X+4Y=72X+Y=15Y=15-X代入8X+4Y=728X+4(15-X)=728X+60-4X=72
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=