1×2+2×4+3×6+4+8×5×10.1005×2010的答案是多少?
1×2+2×4+3×6+4+8×5×10.1005×2010的答案是多少?
我算了答案但不是最简的方法!
我算了答案但不是最简的方法!
数学人气:310 ℃时间:2020-06-02 15:32:08
优质解答
平方和公式 1^2+2^2+3^2+…+n^2=n(n+1)(2n+1)/6 1×2+2×4+3×6+4+8×5×10.1005×2010 =2*(1^2+2^2+3^2+…+1005^2) =2*1005*1006*2011/6 =677727110
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