x^2-x+1/4 x^2-6x+9 25y^2-80y+64 (x-y)^2-10(x-y)+25 -4x^2+12x

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/05/27 06:06:46

x^2-x+1/4 x^2-6x+9 25y^2-80y+64 (x-y)^2-10(x-y)+25 -4x^2+12xy-9y^2 9x^4+12x^2y^2+4y^4

x^2-x+1/4
=x²-2x×1/2+(1/2)²
=(x-1/2)²
x^2-6x+9
=x²-2×x×3+3²
=(x-3)²
25y^2-80y+64
=(5y)²-2×5y×8+8²
=(5y-8)²
(x-y)^2-10(x-y)+25
=[(x-y)-5]²
=(x-y-5)²
-4x^2+12xy-9y^2
=-(4x²-12xy-9y²)
=-(2x-3y)²
9x^4+12x^2y^2+4y^4
=(3x²)²+2×3x²×2y²+(2y²)²
=(3x²+2y²)²

1、x(x-y)(x+y)-x(x+y)^2 1) (2x+5y)(2x-5y)(-4x^2-25y^2) 2) [（x+y)(x-y)-(x-y)^2+2y(x-y (1)(x^2/x)-y-x-y x^2-y^2/x+y-4x(x-y)+y^2/2x-y, 已知4x=9y求(1)x+y/y (2)y-x/2x {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 x/x-y*y^2/x+y-x^3y2/x^4-y^4/x^2/x^2+y^2 (2x-y)^2-4(x-y)(x+2y) (2x-y)²-4(x-y)(x+2y) 化简：（2x-y)²-4(x-y)(x+y) y=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10)的导数在x=1 化简求值:(x+y)-(2x+1/2y)-(3x+1/6y)-(4x+1/12y)-(5x+1/20y)-.(10x+1