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受欢迎的初等代数 >

-1/2 (3)-1

解答

- \frac{1}{2} (3) - 1

解答

- \frac{5}{2}

+1

十进制

- 2.5

求解步骤

- \frac{1}{2} (3) - 1

遵循 PEMDAS 运算顺序

乘除（左右）

- \frac{1}{2} (3) : - \frac{3}{2}

- \frac{1}{2} (3)

使用法则:

(a) = a

(3) = 3

= - \frac{1}{2} \cdot 3

- \frac{1}{2} \cdot 3 = - \frac{3}{2}

- \frac{1}{2} \cdot 3

将项转换为分式:

3 = \frac{3}{1}

= - \frac{1}{2} \cdot \frac{3}{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{3}{1} = \frac{1 \cdot 3}{2 \cdot 1}

= - \frac{1 \cdot 3}{2 \cdot 1}

数字相乘:

1 \cdot 3 = 3

= - \frac{3}{2 \cdot 1}

数字相乘:

2 \cdot 1 = 2

= - \frac{3}{2}

= - \frac{3}{2}

= - \frac{3}{2} - 1

加减（左右）

- \frac{3}{2} - 1 : - \frac{5}{2}

- \frac{3}{2} - 1

- \frac{3}{2} - 1 = - \frac{5}{2}

- \frac{3}{2} - 1

将项转换为分式:

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

= - \frac{1 \cdot 2}{2} - \frac{3}{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 - 3}{2}

- 1 \cdot 2 - 3 = - 5

- 1 \cdot 2 - 3

数字相乘:

1 \cdot 2 = 2

= - 2 - 3

数字相减:

- 2 - 3 = - 5

= - 5

= \frac{- 5}{2}

使用分式法则:

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

= - \frac{5}{2}

= - \frac{5}{2}

= - \frac{5}{2}

流行的例子

(3/5+1/10)\div 7/2

(\frac{3}{5} + \frac{1}{10}) \div \frac{7}{2}

- 0^{2} - 7

180\div 360× 4^2

180 \div 360 \times 4^{2}

4 (8 - 6) + 5

3-(3+2*(5+6\div 3*4))

3 - (3 + 2 \cdot (5 + 6 \div 3 \cdot 4))