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受欢迎的初等代数 >

1/4 (2)-2

解答

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

解答

- \frac{3}{2}

+1

十进制

- 1.5

求解步骤

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

遵循 PEMDAS 运算顺序

乘除（左右）

\frac{1}{4} (2) : \frac{1}{2}

\frac{1}{4} (2)

使用法则:

(a) = a

(2) = 2

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

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

\frac{1}{4} \cdot 2

将项转换为分式:

2 = \frac{2}{1}

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

使用分式法则:

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

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

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

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

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

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

数字相乘:

1 \cdot 2 = 2

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

数字相乘:

4 \cdot 1 = 4

= \frac{2}{4}

= \frac{2}{4}

对数字约分

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

= \frac{1}{2}

= \frac{1}{2}

= \frac{1}{2}

= \frac{1}{2} - 2

加减（左右）

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

\frac{1}{2} - 2

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

\frac{1}{2} - 2

将项转换为分式:

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

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

- 2 \cdot 2 + 1 = - 3

- 2 \cdot 2 + 1

数字相乘:

2 \cdot 2 = 4

= - 4 + 1

数字相加/相减:

- 4 + 1 = - 3

= - 3

= \frac{- 3}{2}

使用分式法则:

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

= - \frac{3}{2}

= - \frac{3}{2}

= - \frac{3}{2}

流行的例子

(-12)^2-4× 4× 9

(- 12)^{2} - 4 \times 4 \times 9

\frac{1}{2} - 8 (\frac{1}{4} + 1)

(1+2)^2+14\div 2+5

(1 + 2)^{2} + 14 \div 2 + 5

1^{2} + 2 (1) - 1

(7/2 \div 4/4)-3/8

(\frac{7}{2} \div \frac{4}{4}) - \frac{3}{8}