帮帮忙做下了： 1.化简（x+y)×x^2/(x^2-y^2)+1/(x-y)-(2x^2y-2xy^2)/(x^2-2

来源：学生作业帮编辑：神马作文网作业帮分类：数学作业时间：2024/09/24 03:20:40

帮帮忙做下了： 1.化简（x+y)×x^2/(x^2-y^2)+1/(x-y)-(2x^2y-2xy^2)/(x^2-2xy+y^2)
2.(x^2-9)/(x^2+5x+6)-(x^2-x-2)/(x^2-2x)+(x^2+2x+4)(x^3-8)

1.化简（x+y)×x^2/(x^2-y^2)+1/(x-y)-(2x^2y-2xy^2)/(x^2-2xy+y^2)
=x^2(x+y)/(x+y)(x-y)+1/(x-y)-2xy(x-y)/(x-y)^2
=x^2/(x-y)+1/(x-y)-2xy/(x-y)
=(x^2-2xy+1)/(x-y)
2.(x^2-9)/(x^2+5x+6)-(x^2-x-2)/(x^2-2x)+(x^2+2x+4)(x^3-8)
=(x+3)(x-3)/(x+3)(x+2)-(x-2)(x+1)/x(x-2)+(x^2+2x+4)/(x-2)(x^2+2x+4)
=(x-3)/(x+2)-(x+1)/x+1/(x+2)
=(x-2)/(x+2)-(x+1)/x
=(x^2-2x-x^2-3x-2)/x(x+2)
=(-5x-2)/x(x+2)
=-(5x+2)/x(x+2)

1、x(x-y)(x+y)-x(x+y)^2 因式分解：x×x-xy-2y×y-x-y (x^2-xy)y÷y-x/xy怎么做? （x^2+xy/x-y)/（xy/x-y)计算化简：x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y) 1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y) [x(x^2y^2-xy)-y(x^2-x^3y)]/3x^2y (1)(x^2/x)-y-x-y 2xy/(x+y)(x+y)与x/(x+y)(x-y)怎么通分化简(x平方-y平方)/(x+y)+(x平方-2xy+y平方)/(x-y) x根号x+x根号y/xy-y^2)-（x+根号xy+y/x根号x-y根号）y 作乘法:(x+y)(x^2-xy+y^2)；(x-y)(x^2+xy+y^2)