1.x^2-3x-102.x(x+y)(x-y)-x(x+y)^23.9(2a+3b)^2-4(3a-2b)^24.已知a^2+a+1=0,求a^3+2a^2+2a+3的值

[2/3x-2/x+y(x+y/3x-x-y)]/x-y/x 化简：{2/3x-2/(x+y)[(x+y)/3x-x-y]}/(x+y)/x 计算2/3x-2/x+y(x+y/3x-x-y)/x-y/x 化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x x(x-y)2-(y-x)3 1.（x+2)^2-(x+y)^32.(x-y)^2-(x-y)^33.(x-y)^2-(y-x)^3 化简 3x(x^2-x-1)-(x+1)(3x^-x) X^3(x-y)+x(y-x) 1.) 5/x-x+12-2x/2x-2x 2)y/2x-2y/3x 3^x+2x=y,x 因式分解3x^2(x-y)+6x(y-x) 1.(x^3-x^2-4x+1)/(x^2-3x+2)-(x^3-2x^2-9x+21)/（x^2-5x+6）+（x^2-3x+8）/（x^2-4x+3）2.{(x^2)/（x-y)}*{y/(x+y)}-{(x^4y)/(x^4-y^4)}÷{（x^2/x^2+y^2）^2} 因式分解：a(x-y)^2+b(y-x)^3 4(x-y)^2+8(y-x)(x+y)1.a(x-y)^2+b(y-x)^3 2.4(x-y)^2+8(y-x)(x+y) 因式分解x(x+y)(x-y)-x(x+y)^2 1.（x+y-z)+(x-y+z)-(x-y-z) 2.2x-(3x-2y+3)-(5y-2) [(3x+y)(x-y)-(2x+3y)(x-y)]*(x-y) 计算：x+2y/x-y+2x/y-x-3y/x-y 化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方 计算：1-2x+x^2/x-x^3*xy+x^2y/x-x^2