展开 (3(n-1))/(2n)

解答

展开

\frac{3 ( n - 1 )}{2 n}

\frac{3}{2} - \frac{3}{2 n}

求解步骤

\frac{3 ( n - 1 )}{2 n}

乘开

3 (n - 1) : 3 n - 3

= \frac{3 n - 3}{2 n}

使用分式法则:

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

\frac{3 n - 3}{2 n} = \frac{3 n}{2 n} - \frac{3}{2 n}

= \frac{3 n}{2 n} - \frac{3}{2 n}

消掉

\frac{3 n}{2 n} : \frac{3}{2}

= \frac{3}{2} - \frac{3}{2 n}

e x p an d \frac{4 ( 1 - x )}{3}

e x p an d d x (2 x - cos (x))

e x p an d (- x^{2} + 3 - e^{4 x - 3})^{2}

e x p an d (csc (x) cot (x) - 2 x) d x

e x p an d \frac{( 1 + ln ( x ) ) ^{2}}{x}