sqrt(x+7)+sqrt(x+2)=5

解答

x + 7 + x + 2 = 5

x = 2

求解步骤

x + 7 + x + 2 = 5

去除平方根

400 = 100 x + 200

解

400 = 100 x + 200 : x = 2

x = 2

验证解:

x = 2

真

解是

x = 2

3 x - 1 + 3 = 0

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

13 = - 4 x - 8 + 3

4 x = 16 x^{2} + 6 x - 12

2 x - 1 - 2 x - 4 = 3