展开 1/(sqrt(2+x))

解答

展开

\frac{1}{2 + x}

\frac{2 + x}{2 + x}

求解步骤

\frac{1}{2 + x}

乘以共轭根式

\frac{2 + x}{2 + x}

= \frac{1 \cdot 2 + x}{2 + x 2 + x}

1 \cdot 2 + x = 2 + x

2 + x 2 + x = 2 + x

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

e x p an d 11 (16 x + 19 z = 31)

e x p an d 3 (x + \frac{1}{3} y = \frac{5}{3})

e x p an d \frac{6}{3}

e x p an d \frac{( a s + b - 7 a )}{( s - 5 ) ( s - 2 )}

e x p an d (4, 7) y (- 3, - 2)