展开 (t(t-2))/((1+t)(1-t))

解答

展开

\frac{t ( t - 2 )}{( 1 + t ) ( 1 - t )}

\frac{t ^{2} - 2 t}{1 - t ^{2}}

求解步骤

\frac{t ( t - 2 )}{( 1 + t ) ( 1 - t )}

乘开

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

= \frac{t ( t - 2 )}{1 - t ^{2}}

乘开

t (t - 2) : t^{2} - 2 t

= \frac{t ^{2} - 2 t}{1 - t ^{2}}

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