Question

数学问题!解答加步骤

求x值
x + 1/x =3
要步骤呀,另外解答能简单点吗,看不懂呀………

Answer 1

求x值
x + 1/x =3
x≠0,
两边同乘以x:
x²+1=3x
x²+1-3x=3x-3x
x²-3x+1=0
x={3±√[(-3)²-4*1*1]}/2=[3±√(5)]/2
x1=[3+√(5)]/2
x2=[3-√(5)]/2

Answer 2

两边同乘x
x^2-3x+1=0
x=3/2±(根号5)/2

Answer 3

方程化为 x^2-3*x+1 = 0
(x-1.5)^2 = 1.25
x1 = 1.5-1.25^0.5 = (3-5^0.5)/2
x2 = 1.5+1.25^0.5 = (3+5^0.5)/2

Answer 4

解：x+1/3x=(4/3)x=3
4x=9
x=9/4

Answer 5

解：x²+1=3x
x²-3x=1
x(x-3)=1
在就不知道了。。。

Answer 6

我看你一天不知道在做什么？这道题还来网上来求教，太不专心了！