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受欢迎的初等代数 >

2/5 × (1-3/4)

解答

\frac{2}{5} \cdot (1 - \frac{3}{4})

解答

\frac{1}{10}

+1

十进制

0.1

求解步骤

\frac{2}{5} (1 - \frac{3}{4})

遵循 PEMDAS 运算顺序

计算括号内的值

(1 - \frac{3}{4}) : \frac{1}{4}

1 - \frac{3}{4}

1 - \frac{3}{4} = \frac{1}{4}

1 - \frac{3}{4}

将项转换为分式:

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

= \frac{1 \cdot 4}{4} - \frac{3}{4}

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 4 - 3}{4}

1 \cdot 4 - 3 = 1

1 \cdot 4 - 3

数字相乘:

1 \cdot 4 = 4

= 4 - 3

数字相减:

4 - 3 = 1

= 1

= \frac{1}{4}

= \frac{1}{4}

= \frac{2}{5} \cdot \frac{1}{4}

乘除（左右）

\frac{2}{5} \cdot \frac{1}{4} : \frac{1}{10}

\frac{2}{5} \cdot \frac{1}{4}

使用分式法则:

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

= \frac{2 \cdot 1}{5 \cdot 4}

消掉

\frac{2 \cdot 1}{5 \cdot 4} : \frac{1}{10}

\frac{2 \cdot 1}{5 \cdot 4}

数字相乘:

2 \cdot 1 = 2

= \frac{2}{5 \cdot 4}

对数字约分

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

= \frac{1}{5 \cdot 2}

数字相乘:

5 \cdot 2 = 10

= \frac{1}{10}

= \frac{1}{10}

= \frac{1}{10}

流行的例子

2 \cdot (- 3)^{2}

(12-10)+(18-14)

(12 - 10) + (18 - 14)

15× (7-3)\div 3-1

15 \times (7 - 3) \div 3 - 1

5 (- 7) + 2

10 - 2 (- 2)