100X^2-81Y^2=?
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x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
100X^2-81Y^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)=
{2x=y x/60+y/100=2.2
x+y=32,2x+4y=100
x+y=43 2x+4y=100
x+y=100 2×16x=18y
2x+3y=100 求x+y=?
(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)
解方程:,(100-x-y)-(x+y)=2
(x-4y)(2x+y)=
(x+y)(2x-3y)=?
x+y>=2,x-y