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2+4×5×6×7×8.×100
人气:111 ℃ 时间:2020-10-02 02:17:32
解答
2+4+6+8...+100
= 2 × (1+2+3+4...+50)
= 2 × (1+50) × 50/2
= 51 × 50
= 2550
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