化简 (-8)/(2x+7)+(-9)/(2x+7)

解答

化简

\frac{- 8}{2 x + 7} + \frac{- 9}{2 x + 7}

- \frac{17}{2 x + 7}

求解步骤

\frac{- 8}{2 x + 7} + \frac{- 9}{2 x + 7}

\frac{- 8}{2 x + 7} = - \frac{8}{2 x + 7}

\frac{- 9}{2 x + 7} = - \frac{9}{2 x + 7}

= - \frac{8}{2 x + 7} - \frac{9}{2 x + 7}

合并

- \frac{8}{2 x + 7} - \frac{9}{2 x + 7} : - \frac{17}{2 x + 7}

= - \frac{17}{2 x + 7}

e x p an d (a - b t)^{2}

s im pl i f y \frac{7}{18}

e x p an d (a + b) (a^{4} - a^{3} b + a^{2} b^{2} - a b^{3} + b^{4})

s im pl i f y \frac{\frac{x ^{2} - 2 x - 3}{x ^{3}}}{\frac{x ^{2} - 6 x - 7}{x}}

s im pl i f y \frac{\frac{x - 2}{x - 1}}{\frac{x ^{2} - 4}{x ^{2} + x - 2}}