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将边长分别为,2,3,4…的正方形的面积记作S1,S2,S3,S4…,计算S2-S1,S3-S2,S4-S3…,若边长为n(n为正整数)的正方形面积记作Sn,根据你计算的规律,猜想:Sn+1-Sn=-
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函数自变量x的取值范围是___________-八年级数学
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若,则的值为A.1B.-1C.7D.-7-八年级数学
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(2011•毕节地区)-八年级数学
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计算:.-八年级数学
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计算:-八年级数学
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