求一个分解因试的题(X²+Y²)(X²-1+Y²)-12=0,求X²+
求一个分解因试的题(X²+Y²)(X²-1+Y²)-12=0,求X²+
若|x+y-1|+(x-y-2)²=0,求代数式(x+2y)(x-2y)-(2x-y)(-y-2x)的值.
求x²+y²-2x+4y+1的最小值 求x,y的值 x²+2xy+4x-12y+22=0
4/X+1/Y=2,XY=-1,求代数式4Y-X/X-2Y/(x+2y-12Y²/x-2y)的值
已知非零有理数x,y满足x²-4xy+4y²=0,求x-y/x+y-y-x/x+y的值.
已知x²+x*y=-1,x*y+y²=2,试求2x²-x*y-3y²的值
已知x+y=1,xy=-二分之一,求x(x+y)(x-y)-x(x+y)²
已知x²-y²=12,x+y=6,求x,y的值
试求函数y=3x²-x+3e^x的导数y',y
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
x²+4y²-2x+12y+10=0求X,Y值
已知y-2x=0,求3x²-2y²/(x+y)(x-y)的值