化简 (7x-2/3)(7x+2/3)

解答

化简

(7 x - \frac{2}{3}) (7 x + \frac{2}{3})

\frac{( 21 x - 2 ) ( 21 x + 2 )}{9}

求解步骤

(7 x - \frac{2}{3}) (7 x + \frac{2}{3})

合并

7 x - \frac{2}{3} : \frac{21 x - 2}{3}

= \frac{21 x - 2}{3} (7 x + \frac{2}{3})

使用分式法则:

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

= \frac{( 21 x - 2 ) ( 7 x + \frac{2}{3} )}{3}

化简

(21 x - 2) (7 x + \frac{2}{3}) : \frac{( 21 x - 2 ) ( 21 x + 2 )}{3}

= \frac{\frac{( 21 x - 2 ) ( 21 x + 2 )}{3}}{3}

使用分式法则:

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

= \frac{( 21 x - 2 ) ( 21 x + 2 )}{3 \cdot 3}

数字相乘:

3 \cdot 3 = 9

= \frac{( 21 x - 2 ) ( 21 x + 2 )}{9}

e x p an d ln (3 u \cdot v \cdot w)

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e x p an d \frac{200 e}{( 1 + e ) ^{2}}

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e x p an d ((1) - sin (x)) (1 + sin (x))