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
答
(7x-1)^2
答
(7x)^2_2*7x+1=0
(7x-1)^2=0
x=1/7
答
(7X一1)平方=O
答
49x^2-14x+1=0
(7x-1)²=0
7x-1=0
7x=1
x=1/7
答
49x^2-14x+1=0
(7x-1)²=0
7x-1=0
7x=1
∴x1=x2=1/7
答
(7x-1)²=0
x=1/7
答
(7X-1)^2=0
7X-1=0
7X=1
X=1/7