zs

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

受欢迎的初等代数 >

1+(-1/2)(22-1)

解答

1 + (- \frac{1}{2}) (22 - 1)

解答

- \frac{19}{2}

+1

十进制

- 9.5

求解步骤

1 + (- \frac{1}{2}) (22 - 1)

遵循 PEMDAS 运算顺序

计算括号内的值

(22 - 1) : 21

22 - 1

22 - 1 = 21

= 21

= 1 + (- \frac{1}{2}) \cdot 21

乘除（左右）

(- \frac{1}{2}) \cdot 21 : - \frac{21}{2}

(- \frac{1}{2}) \cdot 21

使用法则

(- a) \cdot b = - a \cdot b

(- \frac{1}{2}) \cdot 21 = - \frac{1}{2} \cdot 21

将项转换为分式:

21 = \frac{21}{1}

= - \frac{1}{2} \cdot \frac{21}{1}

使用分式法则:

\frac{a}{b} \cdot \frac{c}{d} = \frac{a \cdot c}{b \cdot d}

\frac{1}{2} \cdot \frac{21}{1} = \frac{1 \cdot 21}{2 \cdot 1}

= - \frac{1 \cdot 21}{2 \cdot 1}

数字相乘:

1 \cdot 21 = 21

= - \frac{21}{2 \cdot 1}

数字相乘:

2 \cdot 1 = 2

= - \frac{21}{2}

= 1 - \frac{21}{2}

加减（左右）

1 - \frac{21}{2} : - \frac{19}{2}

1 - \frac{21}{2}

1 - \frac{21}{2} = - \frac{19}{2}

1 - \frac{21}{2}

将项转换为分式:

1 = \frac{1 \cdot 2}{2}

= \frac{1 \cdot 2}{2} - \frac{21}{2}

因为分母相等，所以合并分式:

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

= \frac{1 \cdot 2 - 21}{2}

1 \cdot 2 - 21 = - 19

1 \cdot 2 - 21

数字相乘:

1 \cdot 2 = 2

= 2 - 21

数字相减:

2 - 21 = - 19

= - 19

= \frac{- 19}{2}

使用分式法则:

\frac{- a}{b} = - \frac{a}{b}

= - \frac{19}{2}

= - \frac{19}{2}

= - \frac{19}{2}

流行的例子

5 \times (- 2 - 8)

-6+(-9+2)-(-2-1)+4

- 6 + (- 9 + 2) - (- 2 - 1) + 4

4^{5} + 3^{5}

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

-5{4+[3-(4-8)+(-5-10)]}

- 5 {4 + [3 - (4 - 8) + (- 5 - 10)]}