(x+y)²-4(x+y-1)
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因式分解 (x²+y²-1)²-4x²y²
(X-3)²+(Y+4)²=1 求X²+Y²的最大值
(X-3)²+(Y+4)²=1 求X²+Y²的最大值
求因式分解:(x²+y²)²-4x²y²
(x²+4y²)²-16x²y² 因式分解
(x+y)²-4(x+y-1)
1、x²+4y²+_______=(x-2y)²
-3x²(1/3xy-y²)+4x(x²y-xy²)+x³y,其中x=1,y=
1、(4x²y-2x³)÷(-2x)²2、【(x-y)²+(x+y)(x-y)】÷2x
[(x+2y)²-(x+y)(3x-y)-5y²]÷(2x),其中x,y满足x²+4x+y²-y+17/4=0已知、x+y=6且xy=4(1)x²+y² (2)(x-y)² (3)x{四次方}+y{四次方}第一题没错 书上就这样写的!
化简再求值[(x²+y²)²-4x²y²]÷(x²-y²)其实,x=2,y=2/3.
(3x-2y)²(3x-2y)²(9x²+4y²)²
已知x²-4x+4+(y+x的绝对值)=0,求x²y-x²分之2x+x²÷y²-2y+1分之x²+4x+4另外还有一题:已知x-3y=0,求x²-2xy+y²分之2x+y×(x-y)的值.
分解因式 x²(x²-y²)+z²(y²-x²) (a+b)²+4(a+b+1)
1.5a(m-n)-10a(m-n)2.(x+y)²(x-y)+(x+y)(x-y)²3.x²y²-0.044.-m²+1/165.9a²-12a+46.4x²+20xy+25y²7.x²+7x+128.x²-4xy-96y²
1.已知x/x-1=(y²+4y-1)/(y²+4y-2),则y²+4y-x的值为多少?
1(x-3x-1)(x+3y-1)2(3x-2y+1/4)²3(a+b)²-(a-b)²4 [2x²-(x+y)(x-y)][(-x-y)×(y-x)+2y²],其中x=1 y=25[(0.5x-y)²+(0.5x+y)²](0.5x²-2y²)6(a+3b)²-2(a+3b)(a-3b)+(a-3b)²7
一:(x²+1)y²-x²-1二:-49x²+14x-1+y²