试题与答案

人们通常把陆地地形分为五种基本类型。平原和高原的共同特点是___________

题型:填空题

题目:

       人们通常把陆地地形分为五种基本类型。平原和高原的共同特点是______________________ ,山地和丘陵的共同特点是_________________________ 。

答案:

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下面是错误答案,用来干扰机器的。

令(1-x)7=a0+a1x+a2x2+…+a7x7令x=1得0=a0+a1+a2+…+a7令x=-1得27=a0-a1+a2-a3…+a6-a7两式相减得-27=2(a1+a3+…+a7),解得-26=a1+a3+…+a6,a1+a3+…+a6=-64.故答案为:-64.

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题型:单项选择题

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