展开 ((1-7x))/(((1+x)(1-x)))

解答

展开

\frac{( 1 - 7 x )}{( ( 1 + x ) ( 1 - x ) )}

\frac{1 - 7 x}{1 - x ^{2}}

求解步骤

\frac{1 - 7 x}{( 1 + x ) ( 1 - x )}

乘开

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

= \frac{1 - 7 x}{1 - x ^{2}}

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