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受欢迎的初等代数 >

1-5(4/19)

解答

1 - 5 (\frac{4}{19})

解答

- \frac{1}{19}

+1

十进制

- 0.05263 \dots

求解步骤

1 - 5 (\frac{4}{19})

遵循 PEMDAS 运算顺序

乘除（左右）

5 (\frac{4}{19}) : \frac{20}{19}

5 (\frac{4}{19})

使用法则:

(a) = a

(\frac{4}{19}) = \frac{4}{19}

= 5 \cdot \frac{4}{19}

5 \cdot \frac{4}{19} = \frac{20}{19}

5 \cdot \frac{4}{19}

将项转换为分式:

5 = \frac{5}{1}

= \frac{5}{1} \cdot \frac{4}{19}

使用分式法则:

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

= \frac{5 \cdot 4}{1 \cdot 19}

数字相乘:

5 \cdot 4 = 20

= \frac{20}{1 \cdot 19}

数字相乘:

1 \cdot 19 = 19

= \frac{20}{19}

= \frac{20}{19}

= 1 - \frac{20}{19}

加减（左右）

1 - \frac{20}{19} : - \frac{1}{19}

1 - \frac{20}{19}

1 - \frac{20}{19} = - \frac{1}{19}

1 - \frac{20}{19}

将项转换为分式:

1 = \frac{1 \cdot 19}{19}

= \frac{1 \cdot 19}{19} - \frac{20}{19}

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 19 - 20}{19}

1 \cdot 19 - 20 = - 1

1 \cdot 19 - 20

数字相乘:

1 \cdot 19 = 19

= 19 - 20

数字相减:

19 - 20 = - 1

= - 1

= \frac{- 1}{19}

使用分式法则:

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

= - \frac{1}{19}

= - \frac{1}{19}

= - \frac{1}{19}

流行的例子

5-[6-2(1-8)-3+6]+5

5 - [6 - 2 (1 - 8) - 3 + 6] + 5

\frac{1}{2} 7 (11 + 15)

17 - 6 \times 3

(-3)× (-2)+(-(-(6)))

(- 3) \times (- 2) + (- (- (6)))

3 (9) + 10 \cdot \frac{49}{7}