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受欢迎的初等代数 >

(3-1 1/5)× 1/9

解答

(3 - 1 \frac{1}{5}) \cdot \frac{1}{9}

解答

\frac{1}{5}

+1

十进制

0.2

求解步骤

(3 - 1 \frac{1}{5}) \cdot \frac{1}{9}

将带分数转换为假分式:

1 \frac{1}{5} = \frac{6}{5}

1 \frac{1}{5}

将带分数转换为假分式:

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

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

= \frac{6}{5}

= (3 - \frac{6}{5}) \cdot \frac{1}{9}

遵循 PEMDAS 运算顺序

计算括号内的值

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

3 - \frac{6}{5}

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

3 - \frac{6}{5}

将项转换为分式:

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

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

3 \cdot 5 - 6 = 9

3 \cdot 5 - 6

数字相乘:

3 \cdot 5 = 15

= 15 - 6

数字相减:

15 - 6 = 9

= 9

= \frac{9}{5}

= \frac{9}{5}

= \frac{9}{5} \cdot \frac{1}{9}

乘除（左右）

\frac{9}{5} \cdot \frac{1}{9} : \frac{1}{5}

\frac{9}{5} \cdot \frac{1}{9}

\frac{9}{5} \cdot \frac{1}{9} = \frac{1}{5}

= \frac{1}{5}

= \frac{1}{5}

流行的例子

1 5^{2} + 3 5^{2}

- 5 - 52 - 8 + 20

-2+10-8*9+5*4+12\div 4-11\div 1

- 2 + 10 - 8 \cdot 9 + 5 \cdot 4 + 12 \div 4 - 11 \div 1

(1 + 3)^{2} \cdot 6

2 - 2 (- 4)