展开 4(e-1/e)+2e^2-2/(e^2)

解答

展开

4 (e - \frac{1}{e}) + 2 e^{2} - \frac{2}{e ^{2}}

4 e - \frac{4}{e} + 2 e^{2} - \frac{2}{e ^{2}}

十进制

23.90905 \dots

求解步骤

4 (e - \frac{1}{e}) + 2 e^{2} - \frac{2}{e ^{2}}

乘开

4 (e - \frac{1}{e}) : 4 e - \frac{4}{e}

= 4 e - \frac{4}{e} + 2 e^{2} - \frac{2}{e ^{2}}

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

s im pl i f y x^{2} (\frac{12}{x} - \frac{x}{4})

s im pl i f y (n - 56)^{4} (6 - \frac{n - 7}{8})

e x p an d \frac{x ( x + 5 )}{x ^{2} + 2 x + 20}

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