30(x+y)=400 80(y-x=400 的解,
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y'=(y/x)^2+y/x+4微分方程
(x+y)/2- x-y/2=6 3(x+y)=4(x-y)
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
[x/(x-y)]·[y²/(x+y)]-[x^4y/(x^4-y^4)]÷[x²/(x²+y²)]=
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
化简 x / y(x+y) - y / x(x+y) =
7x:4y,x:y=( ):(
(x-4y)(2x+y)=
5x-4y(y-x)=?
若x+y=4,则多项式1/2(x+y)+4(x-y)-3(x-y)-3/2(x+y)-x+y值是()
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知(x+y)2 =2,(x-y)3 =3,求(x+y)7(x-y)2(x+y)3(y-x)4 的值
.先化简再求值:(2x+y)(2x+y)-(2x-y)平方其中X,Y满足X平方+Y平方-2X+4Y+5=0
x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空
y=X(4-3X) ,y'=4-6x ,y'=0 ,x=2/30
x+x+x+y=60 .x-y=4
y(x+y)+(x-y)²-(x+y)(x-y),其中x=-1/3,y=3
x+x=y+30