化简：(x-y)/(2x+1) * [(2x+1)/(x+y) - (2xy+y)/(y方－x方)]+y/(x+y)

来源：学生作业帮编辑：搜搜考试网作业帮分类：数学作业时间：2024/06/06 02:01:21

[(2x+1)/(x+y) - (2xy+y)/(y方－x方)]
=[(2x+1)(y-x)/(y^2-x^2) - y(2x+1)/(y^2-x^2)]
=(2x+1)(y-x-y)/(y^2-x^2)
=-x(2x+1)/(y^2-x^2)
(x-y)/(2x+1) * [(2x+1)/(x+y) - (2xy+y)/(y方－x方)]+y/(x+y)
=(x-y)/(2x+1) * [-x(2x+1)/(y^2-x^2)]+y/(x+y)
=(x-y)/(2x+1) * [x(2x+1)/(x-y)(x+y))]+y/(x+y)
=x/(x+y)+y/(x+y)
=1

4根号【(x方+xy+y方)/x-y】*1/2根号【(x方-xy加y方)/x+y】*3根号【(x3次方+y3次方】（x＞ x二次方y(x-y)二次方-2xy(y-x)二次方待定系数法因式分解：（1）x方+2xy+y方+x+y-2 （2）x方+xy-2y方+2x+7y-3 [(x+y)-(x-y)二次方]÷2xy 计算4x方-4xy+y方-4x+2y-15 4x方y方-5x方y方-9y方 6已知x+y=2,x-y=1,求分式x方2xy+y方分之x方-y方的值. x方-xy+1/4y方化简求值,若X方-2XY+Y方+1XY-11=0,求X方+6XY+9Y方分之X方-25Y方*5X-25Y分之X+3Y的值已知：3x方+xy-2y方=0,求（x+y/x-y + 4xy/y方-x方）除以 x方+2xy-3y方 / x方-9y方 x方+y方+xy=1 求x-2y的取值范围 4X方﹢Y方﹢XY=1,则2X+Y的最大值整式乘法公式已知X+Y=8,XY=12,求：（1）X方Y+XY方（2）X方-XY+Y方