展开 2(e+1/e-2)

解答

展开

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

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

十进制

2.17232 \dots

求解步骤

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

打开括号

= 2 e + 2 \cdot \frac{1}{e} + 2 (- 2)

使用加减运算法则

+ (- a) = - a

= 2 e + 2 \cdot \frac{1}{e} - 2 \cdot 2

化简

2 e + 2 \cdot \frac{1}{e} - 2 \cdot 2 : 2 e + \frac{2}{e} - 4

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

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

\frac{\partial}{\partial u} ((f (u)) (1, - 1))

e x p an d \frac{( 120 - x ) ^{2}}{4}

e x p an d (\frac{3 x - y}{3})^{14}

e x p an d \frac{( 16 + x - 4 ) ( x + 2 ) ( 9 + x + 3 )}{x}