sqrt(1-2x)-sqrt(13+x)=sqrt(x+4)

解答

1 - 2 x - 13 + x = x + 4

x = - 4

求解步骤

1 - 2 x - 13 + x = x + 4

去除平方根

52 - 100 x - 8 x^{2} = 4 x^{2} - 40 x + 100

解

52 - 100 x - 8 x^{2} = 4 x^{2} - 40 x + 100 : x = - 4, x = - 1

x = - 4, x = - 1

验证解:

x = - 4

真

, x = - 1

假

解是

x = - 4

3 x - 15 - 13 = - 10

\frac{8 x + 8}{7 x ^{\frac{6}{7}}} = 0

x - 3 \times 2 x + 2 = x + 1

3 8 r + 1 = 3 r + 8

y = \frac{y + 2}{5 - y}