用【因式分解法】解4X²-1=0 用【直接开平方法】解9X²+6X+1=4
人气：202 ℃ 时间：2020-05-20 22:10:59
解答
1)
4X²-1 = (2x+1)(2x-1) =0
所以x= -1/2或者x=1/2
2)
9X²+6X+1 = (3x+1)² = 4
3x+1 = 2或3x +1 = -2
所以x =1/3或x = -1
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