x^4+x^3+3x^2+2x+2,x^2+3ax-10a^2-x+2a,4x^2-y^2+2y-1

x^4+x^3+3x^2+2x+2,x^2+3ax-10a^2-x+2a,4x^2-y^2+2y-1 (2x+y)(2x-3y)+x(2y+y) 2a(x-y)-4b(x-y) 因式分解 (1) ax^4-81a (2) 4x^2(x-y)+2x(x-y) (3) a^2x^2+4a^2xy+4a 1.（2x-y)(4x^2-y^2)(2x+y) 2.(1+x)(1-x)(1+x^2)(a+x^4) 3.方程（x+3 因式分解 (1)6(x-y)^3-3y(y-x)^2 (2)x(x-y)(a-b)-y(y-x)( x/x-y*y^2/x+y-x^3y2/x^4-y^4/x^2/x^2+y^2 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 计算（1）x/x+y-x/x-y （2）a+2+4/a+2 （3）x^2-y^2/xy÷(x+y) 1、x(x-y)(x+y)-x(x+y)^2 已知集合A={（x,y)| (y-3)/ (x-1)=2,x,y∈R},B={（x,y)| 4x+ay=16,x,y∈ (x+3y-4)(2x-y) (1)计算：a-(a^2)/(a+1)-1 (2)计算：3x/(x-4y)+(x+y)/(4y-x)-7y/(x-4y)