展开-(5(-2y+x))/4

解答

展开

- \frac{5 ( - 2 y + x )}{4}

\frac{5 y}{2} - \frac{5 x}{4}

求解步骤

- \frac{5 ( - 2 y + x )}{4}

乘开

5 (- 2 y + x) : - 10 y + 5 x

= - \frac{5 x - 10 y}{4}

使用分式法则:

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

\frac{- 10 y + 5 x}{4} = - (- \frac{10 y}{4}) - (\frac{5 x}{4})

= - (- \frac{10 y}{4}) - (\frac{5 x}{4})

去除括号:

(a) = a, - (- a) = a

= \frac{10 y}{4} - \frac{5 x}{4}

消掉

\frac{10 y}{4} : \frac{5 y}{2}

= \frac{5 y}{2} - \frac{5 x}{4}

e x p an d \frac{2 ( 5 + s ^{2} )}{( s - 2 ) ( s + 2 ) ( s ^{2} + 4 )}

e x p an d 0.2707065 (\frac{1}{π} arctan (\frac{0.15}{x}) + 0.5)

e x p an d lo g_{10} (7 x^{3})

e x p an d (k + 1) (k^{2} + k + 1)

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