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数学
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使下列等式成立x²+20x+_____=﹙x+_____﹚²
x²-5x+_____=﹙x-____﹚²
x²-1/3x+_____=﹙x-______﹚²
2x²-7x+_____=2﹙x-____﹚²
人气:281 ℃ 时间:2019-12-19 09:04:36
解答
100 10
25/4 5/2
1/36 1/6
49/16 7/4
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