展开 (2(a^2-b^2))/(ab)

解答

展开

\frac{2 ( a ^{2} - b ^{2} )}{ab}

\frac{2 a}{b} - \frac{2 b}{a}

求解步骤

\frac{2 ( a ^{2} - b ^{2} )}{ab}

乘开

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

= \frac{2 a ^{2} - 2 b ^{2}}{ab}

使用分式法则:

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

\frac{2 a ^{2} - 2 b ^{2}}{ab} = \frac{2 a ^{2}}{ab} - \frac{2 b ^{2}}{ab}

= \frac{2 a ^{2}}{ab} - \frac{2 b ^{2}}{ab}

消掉

\frac{2 a ^{2}}{ab} : \frac{2 a}{b}

= \frac{2 a}{b} - \frac{2 b ^{2}}{ab}

消掉

\frac{2 b ^{2}}{ab} : \frac{2 b}{a}

= \frac{2 a}{b} - \frac{2 b}{a}

e x p an d u^{2} + (6) u - (\frac{( - 7 ) ^{3}}{27})

e x p an d \frac{( a x + x ) ( a y + y )}{a ^{2}}

e x p an d y + (2 x + y^{2} e^{y}) y^{'} (x)

e x p an d \frac{1}{s \cdot ( s ^{2} + s + 4 )}

e x p an d (x^{2} + 7 x + 2) (e^{x} - ln (x))