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受欢迎的代数 >

化简 (2ab)/(a^2-b^2)-b/(a-b)+4/2

解答

化简

\frac{2 ab}{a ^{2} - b ^{2}} - \frac{b}{a - b} + \frac{4}{2}

解答

\frac{- a ^{2} b - 4 a b ^{2} + 3 b ^{3} + 2 a ^{3}}{( a - b ) ( a ^{2} - b ^{2} )}

求解步骤

\frac{2 ab}{a ^{2} - b ^{2}} - \frac{b}{a - b} + \frac{4}{2}

a^{2} - b^{2}, a - b, 2

的最小公倍数:

2 (a - b) (a^{2} - b^{2})

根据最小公倍数调整分式

= \frac{4 ab ( a - b )}{2 ( a - b ) ( a ^{2} - b ^{2} )} - \frac{b \cdot 2 ( a ^{2} - b ^{2} )}{2 ( a - b ) ( a ^{2} - b ^{2} )} + \frac{4 ( a - b ) ( a ^{2} - b ^{2} )}{2 ( a - b ) ( a ^{2} - b ^{2} )}

使用分式法则:

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

= \frac{4 ab ( a - b ) - b \cdot 2 ( a ^{2} - b ^{2} ) + 4 ( a - b ) ( a ^{2} - b ^{2} )}{2 ( a - b ) ( a ^{2} - b ^{2} )}

化简

4 ab (a - b) - b \cdot 2 (a^{2} - b^{2}) + 4 (a - b) (a^{2} - b^{2}) : - 2 a^{2} b - 8 a b^{2} + 6 b^{3} + 4 a^{3}

= \frac{- 2 a ^{2} b - 8 a b ^{2} + 6 b ^{3} + 4 a ^{3}}{2 ( a - b ) ( a ^{2} - b ^{2} )}

消掉

\frac{- 2 a ^{2} b - 8 a b ^{2} + 6 b ^{3} + 4 a ^{3}}{2 ( a - b ) ( a ^{2} - b ^{2} )} : \frac{- a ^{2} b - 4 a b ^{2} + 3 b ^{3} + 2 a ^{3}}{( a - b ) ( a ^{2} - b ^{2} )}

= \frac{- a ^{2} b - 4 a b ^{2} + 3 b ^{3} + 2 a ^{3}}{( a - b ) ( a ^{2} - b ^{2} )}

流行的例子

因式分解 4q^2-9

f a c t or 4 q^{2} - 9

2 x^{2} - 4 x - 7 = 0

(-8)/9+5/7-(4/5-(-2)/7+13/7)

\frac{- 8}{9} + \frac{5}{7} - (\frac{4}{5} - \frac{- 2}{7} + \frac{13}{7})

- 7 < 8 + 3 x \leq 11

化简 (((2/3)^2)^3)^{-4}

s im pl i f y ((\frac{2}{3})^{2})^{3}^{- 4}