展开 y/((x-0.4)(x+7))

解答

展开

\frac{y}{( x - 0.4 ) ( x + 7 )}

\frac{y}{x ^{2} + 6.6 x - 2.8}

求解步骤

\frac{y}{( x - 0.4 ) ( x + 7 )}

乘开

(x - 0.4) (x + 7) : x^{2} + 6.6 x - 2.8

= \frac{y}{x ^{2} + 6.6 x - 2.8}

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