x+3y/x^2+xy+y-x/xy+y^2

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x+3y/x^2+xy+y-x/xy+y^2
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x+3y/x^2+xy+y-x/xy+y^2
x+3y/x^2+xy+y-x/xy+y^2

x+3y/x^2+xy+y-x/xy+y^2
原式=(xy+3y²+xy-x²)/xy(x+y)
=-(x²-2xy-3y²)/xy(x+y)
=-(x-3y)(x+y)/xy(x+y)
=(3y-x)/xy

(a²-3ab+b²)/ab
=(a²+b²)/ab-3ab/ab
=(a²+b²)/ab-3
由乘法分配律
(a-b)c
=ac-bc
所以ac-bc=(a-b)c

-x-3xy+y 【x(xy-xy)-y(x-xy)】÷3xy 因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y) X^Y-2XY^2+y^3 |x|/x+y/|y|+xy/|xy|= （x^2+xy/x-y)/（xy/x-y)计算 2x²y-3(2xy-xy)-xy (-x-y)(x^2+xy+y^2) 化简x^-y^/x^-2xy+y^ 2*(x-y)²(y-x)(xy) x^2-xy-6y^2+3xy+y+2 因式分解 x-xy+3y-3x 2x+xy-y-4x+5y-6 x*x+xy=3,xy+y*y=2,则x*x+2xy+y*y=________? (x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)答案应为-2x-x*x-3x， 化简：3x^2-[5xy-(x^y-3xy)+4x^2y-8xy] 1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y) 化简：x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y) -xy^2(x+y)^3+x(x+y)^2因式分解