확장 (9nx^2(n-1))/2

해법

확장

\frac{9 n x ^{2} ( n - 1 )}{2}

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

솔루션 단계

\frac{9 n x ^{2} ( n - 1 )}{2}

9 n x^{2} (n - 1)

확대한다:

9 n^{2} x^{2} - 9 n x^{2}

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

분수 규칙 적용:

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

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

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