化简 3/(2+i)

解答

化简

\frac{3}{2 + i}

\frac{6}{5} - \frac{3}{5} i

求解步骤

\frac{3}{2 + i}

乘以共轭根式

\frac{2 - i}{2 - i}

= \frac{3 ( 2 - i )}{( 2 + i ) ( 2 - i )}

化简

\frac{3 ( 2 - i )}{( 2 + i ) ( 2 - i )} : \frac{6 - 3 i}{5}

= \frac{6 - 3 i}{5}

Rewrite in standard complex form:

\frac{6}{5} - \frac{3}{5} i

= \frac{6}{5} - \frac{3}{5} i

20 - 3 (2 + t) = 2 t + 4

x^{2} - 2 x + 65 = 0

3 x^{2} - 10 x - 2 = 0

- 6 (- n - 5) = - 3 (- 4 + 4 n)

(x + 1) (x + 2) = - 3 x - 3