分式的加减法 1.xx/x-1-x-12.（x-y+4xy/x-y）(x+y-4xy/x+y )3.a-b+2bb/a+

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分式的加减法
1.xx/x-1-x-1
2.（x-y+4xy/x-y）(x+y-4xy/x+y )
3.a-b+2bb/a+b

1.x^2/(x-1)-x-1=(x^2-x^2+1)/(x-1)=1/(x-1)
2.（x-y+4xy/x-y）(x+y-4xy/x+y )
=[(x^2-2xy+y^2+4xy)/(x-y)][x^2+2xy+y^2-4xy)/(x+y)]
=[(x+y)^2/(x-y)][(x-y)^2/(x+y)]
=(x+y)/(x-y)
3. a-b+2bb/(a+b)
=(a^2-b^2+2b^2)/(a+b)
=(a^2+b^2)/(a+b)

1/x-1/y=4,求分式（3x+xy-3y）/(x-2xy-y) （1）.设A=2X²-3Xy+y²+X-3y,B=4X²-6xy+2y²+4X- 1.设A=2x²-3xy+y²+x-3y,B=4x²-6xy+2y²+4x-y, 1.设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²-3x-y, 分解因式1.2a(x-y)-3b(y-x)2.-x^y-2xy+35y3.a^(x-y)-4b^(x-y)若|a+2|+ 分式的加减法：实数x、y满足x^2+y^2+8x+6y+25=0,求x^2-4y^2/x^2+4xy+4y^2-x/x+ 计算（1）x/x+y-x/x-y （2）a+2+4/a+2 （3）x^2-y^2/xy÷(x+y) 因式分解(x-y)^2+4(x^2-y^2)+4(x+y)^2 a(x^2+2xy+y^2)-b(x^2-y^2) (x A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y,若x= 设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²-3x-y,若x 设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y.若x 1/x+1/y=3.求分式3x-2xy+3y/x+xy+y的值