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用简便方法计算:51^2-51x98+49^2
人气:169 ℃ 时间:2019-12-17 17:22:26
解答
完全平方公式
x^2-2XY-Y^2=(X-Y)^2
51^2-51x98+49^2
=51^2-2x51x49+49^2
=(51-49)^2
=4
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