solvefor x,x-10sqrt(x)+9=0

解答

x, x - 10 x + 9 = 0

x = 81, x = 1

求解步骤

x - 10 x + 9 = 0

去除平方根

100 x = x^{2} + 18 x + 81

解

100 x = x^{2} + 18 x + 81 : x = 81, x = 1

x = 81, x = 1

验证解:

x = 81

真

, x = 1

真

解为

x = 81, x = 1

x (x + 3) = x^{2} + 3 x

3 4 (y - 2)^{2} = 75

so l v e f or q, 5 = 5 q^{- 0.5}

5 + x = 25 + x^{2}

x + 7 - x = 11