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受欢迎的初等代数 >

9/5-6*4/8

解答

\frac{9}{5} - 6 \cdot \frac{4}{8}

解答

- \frac{6}{5}

+1

十进制

- 1.2

求解步骤

\frac{9}{5} - 6 \cdot \frac{4}{8}

\frac{4}{8} = \frac{1}{2}

约分:

4

\frac{1}{2}

= \frac{9}{5} - 6 \cdot \frac{1}{2}

遵循 PEMDAS 运算顺序

乘除（左右）

6 \cdot \frac{1}{2} : 3

6 \cdot \frac{1}{2}

将项转换为分式:

6 = \frac{6}{1}

= \frac{6}{1} \cdot \frac{1}{2}

使用分式法则:

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

= \frac{6 \cdot 1}{1 \cdot 2}

\frac{6 \cdot 1}{1 \cdot 2} = 3

\frac{6 \cdot 1}{1 \cdot 2}

\frac{6 \cdot 1}{1 \cdot 2} = \frac{6}{2}

\frac{6 \cdot 1}{1 \cdot 2}

数字相乘:

6 \cdot 1 = 6

= \frac{6}{1 \cdot 2}

数字相乘:

1 \cdot 2 = 2

= \frac{6}{2}

= \frac{6}{2}

数字相除:

\frac{6}{2} = 3

= 3

= 3

= \frac{9}{5} - 3

加减（左右）

\frac{9}{5} - 3 : - \frac{6}{5}

\frac{9}{5} - 3

\frac{9}{5} - 3 = - \frac{6}{5}

\frac{9}{5} - 3

将项转换为分式:

3 = \frac{3 \cdot 5}{5}

= - \frac{3 \cdot 5}{5} + \frac{9}{5}

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{- 3 \cdot 5 + 9}{5}

- 3 \cdot 5 + 9 = - 6

- 3 \cdot 5 + 9

数字相乘:

3 \cdot 5 = 15

= - 15 + 9

数字相加/相减:

- 15 + 9 = - 6

= - 6

= \frac{- 6}{5}

使用分式法则:

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

= - \frac{6}{5}

= - \frac{6}{5}

= - \frac{6}{5}

流行的例子

20 - [15 - (4 + 28)]

5\div 32-2(3\div 64)

5 \div 32 - 2 (3 \div 64)

42 - 4 (3 - 1)

8-1× 0+2\div 2

8 - 1 \times 0 + 2 \div 2

5\div 8+4\div 6-8\div 9+2\div 3-2\div 24

5 \div 8 + 4 \div 6 - 8 \div 9 + 2 \div 3 - 2 \div 24