x^2-4y/4x^2-8xy
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x^2-4y/4x^2-8xyx^2-4y/4x^2-8xyx^2-4y/4x^2-8xy(x^2-4y^2)/(4x^2-8xy)=(x^2-4y^2)/4x(x-2y)=(x+2y)(x-2y)/
x^2-4y/4x^2-8xy
x^2-4y/4x^2-8xy
x^2-4y/4x^2-8xy
(x^2-4y^2)/(4x^2-8xy)
=(x^2-4y^2)/4x(x-2y)
=(x+2y)(x-2y)/4x(x-2y)
=(x+2y)/4x
化简：3x^2-[5xy-(x^y-3xy)+4x^2y-8xy]
因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y)
诺x+y=6,xy=4 求(5x-4y-3xy)-(8x-y+2xy)
(x^2+2xy+y^2-4xy)*(x^2-2xy+y^2+4xy)
因式分解：x-4xy-2xy+8y等于?
(x+y)(x+y+2xy)+(xy+1)(xy-1)(x+y)(x-y)+4(y-1)
(x^-4y^)/(x^+2xy+y^)/(x+2y)/(2x^+2xy)
因式分解 x-xy+3y-3x 2x+xy-y-4x+5y-6
（-3x^y+2xy)-( )=4x^+xy
2x(x-y)+4xy(y-x) 因式分解2x(x-y)+4xy(y-x) 因式分解
计算:2xy/(x+y)².(x+y)/4y
（12x^2y-8xy^2+16xy）/-3x+2y-4=?
(12x^2y-8xy^2+16xy）/-3x+2y-4=?
x^2-4y/4x^2-8xy
计算:4xy-(x+y)^2/xy(x+y)(x-y)÷x^2+xy-2y^2/x^2y+2xy^2
-4x²y-8xy²+2x²y-3xy²
-4x²y-8xy²+2x²y-3xy²
x>0,y>o,x+2y+4xy=8,xy的最小值是多少