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x-2-sqrt(x)=0

解答

x - 2 - x = 0

解答

x = 4

求解步骤

x - 2 - x = 0

去除平方根

x = x^{2} - 4 x + 4

解

x = x^{2} - 4 x + 4 : x = 4, x = 1

x = 4, x = 1

验证解:

x = 4

真

, x = 1

假

解是

x = 4

流行的例子

(x-5)^{3/4}-27=0

(x - 5)^{\frac{3}{4}} - 27 = 0

sqrt(4x+1)+x=sqrt(5)

4 x + 1 + x = 5

0 = x^{2} - 9

x^{\frac{3}{4}} = - 8

2 x + 9 = 21