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苏教版高中数学选修2-2推理案例赏析这一节中,安排了这样一道例题:我们知道,1+2+3+…+n=n(n+1)/2(一次式和),那么1~2+2~2+3~2+…+n~2=?(二次式和)
Sujiao version of high school mathematics elective 2-2 reasoning case Appreciation In this section, arranged such a case: We know that 1 +2 +3 + ... + n = n (n +1) / 2 (a and), Then 1 ~ 2 + 2 ~ 2 + 3 ~ 2 + ... + n ~ 2 =? (Quadratic sum)