2x=y-52x=20吗?
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x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
2x=y-52x=20吗?
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6
x²-4y² x+2y---------- ÷ --------分数线x²+2xy+y² x²+xyx²-4y² x+2y----------÷--------分数线x²+2xy+y² x²+xy(x+2y)(x-2y)x(x+y)=----------------(x+y)(x+y)(x+2y)(x-y)x=------(x+y)这样对了吗?
已知x^2+y^2-8x+12y+52=0 ,求1/2x-1/x-y(x-y/2x-x^2+y^2)
已知x^2+y^2-8x+12y+52=0 ,求1/2x-1/x-y(x-y/2x-x^2+y^2)
填空:x-y/x+y=( )/x^2-y^2
(x-y)2•(y-x)³(x-y)=?
解方程组 2x-y=5 2y/x-x/y=12x-y=52y/x-x/y=1
x+x+x+y=20 x+x+y=14 x=?y=?
x+x+x+y=52 y+y+y+x=36求x
y=x^2-2x(x
y=x^2+2x(x
3^x+2x=y,x
(x+y)(x-y)+(x-y)平方-(x-y)(3x-y) 其中x=-2 y=3分之一
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=