x+y>=2,x-y
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x+y>=2,x-yx+y>=2,x-yx+y>=2,x-y由题意的x≥2-yx≤2+y∴2-y≤x≤2+y4-2y≤2x≤4+2y4-3y≤2x-y≤4+y∵0≤y≤3∴-3≤-y≤0-9≤-3y≤
x+y>=2,x-y
x+y>=2,x-y
x+y>=2,x-y
由题意的x≥2-y x≤2+y
∴2-y≤x≤2+y 4-2y≤2x≤4+2y 4-3y≤2x-y≤4+y
∵0≤y≤3∴-3≤-y≤0 -9≤-3y≤0 4≤4+y≤7 -5≤4-3y≤4
∴-5≤2x-y≤7 -5≤m≤7
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
填空：x-y/x+y=( )/x^2-y^2
（x-y)2•(y-x)³(x-y)=?
y+y'-2y=2x
微分方程y - 2y' + y = x
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
(x+y)(x-y)+(x-y)平方-(x-y)(3x-y) 其中x=-2 y=3分之一
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
(x-4y)(2x+y)=
(x+y)(2x-3y)=?
x+y>=2,x-y
x+y>=2,x-y
y'-2y=(e^x)-x
y'+2y/x=x通解
dy/dx=(2x*x*x*y-y*y*y*y)/(x*x*x*x-2x*y*y*y)
x²-(x-2y)(x+2y)+(x²-y)(y+x²)=?
化简 x / y(x+y) - y / x(x+y) =
化简y(x+y)+(x+y)(x-y)-x^2