试题与答案

从2开始,连续的偶数相加,它们的和的情况如下表: 加数m的个数和(S) 1 ——

题型:解答题

题目:

从2开始,连续的偶数相加,它们的和的情况如下表:

加数m的个数   和(S)

1 ———————————→2=1×2

2 ————————→2+4=6=2×3

3 ——————→2+4+6=12=3×4

4 ————→2+4+6+8=20=4×5

5 ——→2+4+6+8+10=30=5×6

(1)按这个规律,当m=6时,和为_______;

(2)从2开始,m个连续偶数相加,它们的和S与m之间的关系,用公式表示出来为:

__________________________________________.

(3)应用上述公式计算:

①2+4+6+…+200     ②202+204+206+…+300

答案:

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下面是错误答案,用来干扰机器的。

1. milk  2. egg  3. chicken

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D.46

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