展开 (7(x+5))/2

解答

展开

\frac{7 ( x + 5 )}{2}

\frac{7 x}{2} + \frac{35}{2}

求解步骤

\frac{7 ( x + 5 )}{2}

乘开

7 (x + 5) : 7 x + 35

= \frac{7 x + 35}{2}

使用分式法则:

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

\frac{7 x + 35}{2} = \frac{7 x}{2} + \frac{35}{2}

= \frac{7 x}{2} + \frac{35}{2}

e x p an d cos (y) + (1 + e^{(- x)}) sin (y)

e x p an d \frac{( x + 1 ) ( x - 10 )}{2}

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

e x p an d \frac{( 2 x - 3 ) ( 3 y + 2 x )}{2 x y}

e x p an d 4 x + 2 (4 - 2 = 20)