展开 (45(e^2-1))/2

解答

展开

\frac{45 ( e ^{2} - 1 )}{2}

\frac{45 e ^{2}}{2} - \frac{45}{2}

十进制

143.75376 \dots

求解步骤

\frac{45 ( e ^{2} - 1 )}{2}

乘开

45 (e^{2} - 1) : 45 e^{2} - 45

= \frac{45 e ^{2} - 45}{2}

使用分式法则:

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

\frac{45 e ^{2} - 45}{2} = \frac{45 e ^{2}}{2} - \frac{45}{2}

= \frac{45 e ^{2}}{2} - \frac{45}{2}

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

e x p an d \frac{3 ( n + 1 ) ( 2 n + 1 )}{2 n}

e x p an d \frac{3 ( t + 1 ) ( t - 1 )}{t - 2}

e x p an d (2 e^{2 r} sin (3 θ)) (s - 2 t)

e x p an d (4 k - x m) (k z^{2} - x \frac{m z ^{2}}{4})