2x²-8=0.2x²-8=0(2x+3)²+3=0(x-1)²-4=0
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![2x²-8=0.2x²-8=0(2x+3)²+3=0(x-1)²-4=0](/uploads/image/z/11949178-58-8.jpg?t=2x%26%23178%3B-8%3D0.2x%26%23178%3B-8%3D0%EF%BC%882x%2B3%EF%BC%89%26%23178%3B%2B3%3D0%EF%BC%88x-1%EF%BC%89%26%23178%3B-4%3D0)
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2x²-8=0.2x²-8=0(2x+3)²+3=0(x-1)²-4=0
2x²-8=0.
2x²-8=0
(2x+3)²+3=0
(x-1)²-4=0
2x²-8=0.2x²-8=0(2x+3)²+3=0(x-1)²-4=0
第一个是x=2 第三个是x=3