化简(1-4y)(1+4y)+(1+4y)²
代数式4y² - 2y + 5 = 7,那么代数式2y² - y + 1
已知y²-3y+1=0,求下列分式的值 y²+(1/y²) y²/y的4次方+y
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
已知5(y+1)-3y>2(2y+3)+4化简|2y-1|-|1+2y|.
化简:f(y)=(25y^2-5y+1)(5y+1)-5(1-4y^2)
[(y-2x)(-2x-y)-4(x-2y)²]*2y,其中x=1,y=2
1 4(x-y+1)+y(y-2x)
把4(x-y+1)+y(y-2x)因式分解
4(x-y+1)+y(y-2x)
1) (2x+5y)(2x-5y)(-4x^2-25y^2) 2) [(x+y)(x-y)-(x-y)^2+2y(x-y
【(X²+Y²)-(X-Y)²+2Y(X-Y)】/4Y=1,求4X/4X²-Y&