90+1.5x=y 100+2x=y y=?
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x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
90+1.5x=y 100+2x=y y=?
y+y'-2y=2x
微分方程y - 2y' + y = x
(x-y)(x-2y)+(x-2y)(x-7y),其中X=4,Y=1.5
化简 x / y(x+y) - y / x(x+y) =
填空:x-y/x+y=( )/x^2-y^2
(x-y)2•(y-x)³(x-y)=?
[(x-y)²+(x+y)(x-y)]/2xx=3,y=-1.5
(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)=
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空
[3x^2-(x+y)(y-x)][2(-x-y)(y-x)+2x^2+3y^2],其中x=-2分之1,y=1.5
(x-4y)(2x+y)=
(x+y)(2x-3y)=?
x+y>=2,x-y
x+y>=2,x-y