展开 (a^{20}=-11+20-1)*2

解答

展开

(a^{20} = - 11 + 20 - 1) \cdot 2

2 a^{20} = 16

求解步骤

(a^{20} = - 11 + 20 - 1) \cdot 2

= 2 (= a^{20} - 11 + 20 - 1)

打开括号

2 a^{20} = 2 (- 11) + 2 \cdot 20 + 2 (- 1)

使用加减运算法则

+ (- a) = - a

2 a^{20} = - 2 \cdot 11 + 2 \cdot 20 - 2 \cdot 1

乘开

- 2 \cdot 11 + 2 \cdot 20 - 2 \cdot 1 : 16

2 a^{20} = 16

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

e x p an d \frac{( x + 7 ) ( x + 5 )}{x + 6}

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

e x p an d - e^{- x - y} (1 + e^{x + y})

e x p an d 3 (2 x + 5 y = 15)