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数学
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把二次函数y=-3x^2+6x-1化为顶点式
人气:149 ℃ 时间:2020-05-24 01:26:02
解答
y=3x^2+6x-1
=3(x^2+2x)-1
=3(x^2+2x+1-1)-1
=3(x+1)^2-4
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