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### 括号

4 (7) = 28

#### 例2

sin (a + b)

sin a + b = sin (a) + b

sin (x)

sin x

#### 例3

sin (x) · a = a · sin x

sin x · a = a · sin x

sin (x · a)

sin x · (a) = (sin x) · (a) = a · sin x

#### 例4

log (an ) = n · log a

log an = n · log a

log (a)n =  (log a)n

#### 例5 #### 例6 #### 例7 #### 例8

(−2)4 = 16

−24 = − (+2)4 = −16

(−2)3 = −8 = −23

#### 例9

(a + b)2 = (a + b) (a + b) = a2 + 2ab + b2 #### 例10

(1 − 1) + (1 − 1) + (1 − 1) +  ··· = 0 1 − (1 − 1) − (1 − 1) − (1 − 1) −  ··· = 1 1 − 1 + 1 − 1 + 1 − 1 +  ··· = ?
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