展开 ((-6+n)(6+n))/4

解答

展开

\frac{( - 6 + n ) ( 6 + n )}{4}

\frac{n ^{2}}{4} - 9

求解步骤

\frac{( - 6 + n ) ( 6 + n )}{4}

乘开

(- 6 + n) (6 + n) : n^{2} - 36

= \frac{n ^{2} - 36}{4}

使用分式法则:

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

\frac{n ^{2} - 36}{4} = \frac{n ^{2}}{4} - \frac{36}{4}

= \frac{n ^{2}}{4} - \frac{36}{4}

数字相除:

\frac{36}{4} = 9

= \frac{n ^{2}}{4} - 9

e x p an d t esc a l o n (t - 1)

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