化简：f(y)=(25y^2-5y+1)(5y+1)-5(1-4y^2)

化简：f(y)=(25y^2-5y+1)(5y+1)-5(1-4y^2) 1) (2x+5y)(2x-5y)(-4x^2-25y^2) 2) [（x+y)(x-y)-(x-y)^2+2y(x-y 化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1 解方程：3y^2-(2y+1)(y-1)=(y-5)(y+1) 解方程3y^2-(2y+1)(y-2)=(y-5)(y-1) 解3y+5/3y-6=1/2+5y-4/2y-4 代数式4y² - 2y + 5 = 7,那么代数式2y² - y + 1 微分方程(1)(y'')^2+5y'-y+x=0;(2)y''+5y'+4y^2-8x=0;(3)(3x+2y)dx+( 已知5(y+1)-3y>2(2y+3)+4化简|2y-1|-|1+2y|. 解方程y-[3y-1]等于5【y+2] （x+2)(x+3) (x-4)(x+1) (y+4)(y-2) (y-5)(y-3) 初二解分式方程5/y^2+y-1/y^2-y=0