用因式分解法解49x^2-14x+1=0

问题描述:

用因式分解法解49x^2-14x+1=0

(7x-1)^2

(7x)^2_2*7x+1=0
(7x-1)^2=0
x=1/7

(7X一1)平方=O

49x^2-14x+1=0
(7x-1)²=0
7x-1=0
7x=1
x=1/7

49x^2-14x+1=0
(7x-1)²=0
7x-1=0
7x=1
∴x1=x2=1/7

(7x-1)²=0
x=1/7

(7X-1)^2=0
7X-1=0
7X=1
X=1/7