展开 8/(8-sqrt(7))

解答

展开

\frac{8}{8 - 7}

\frac{8 ( 8 + 7 )}{57}

十进制

1.49414 \dots

求解步骤

\frac{8}{8 - 7}

乘以共轭根式

\frac{8 + 7}{8 + 7}

= \frac{8 ( 8 + 7 )}{( 8 - 7 ) ( 8 + 7 )}

(8 - 7) (8 + 7) = 57

= \frac{8 ( 8 + 7 )}{57}

e x p an d (6 x - 3) (2 x + 4 = 3)

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

e x p an d \frac{2 ( x ^{2} + 2 x + 1 )}{25}

e x p an d - 4 (2 x - 5 = 15)

e x p an d \frac{f ( x + h ) - x ^{2} - 6 x + 3}{h}