展开-1+7*((5m-2))/5

解答

展开

- 1 + 7 \cdot \frac{( 5 m - 2 )}{5}

- 1 + 7 m - \frac{14}{5}

求解步骤

- 1 + 7 \cdot \frac{5 m - 2}{5}

7 \cdot \frac{5 m - 2}{5} = \frac{35 m - 14}{5}

= - 1 + \frac{35 m - 14}{5}

使用分式法则:

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

\frac{35 m - 14}{5} = \frac{35 m}{5} - \frac{14}{5}

= - 1 + \frac{35 m}{5} - \frac{14}{5}

数字相除:

\frac{35}{5} = 7

= - 1 + 7 m - \frac{14}{5}

e x p an d - \frac{( 2 )}{( x + a ) ^{2}}

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

e x p an d ln (\frac{x ^{2}}{y ^{5}})

e x p an d [t (t^{2} + 1) + 2 t^{3}] (2 t)

e x p an d D x [(e^{x} + 4) (x^{2} - \frac{1}{2})]