1⼀1×2×3+1⼀2×3×4+1⼀3×4×5+……+1⼀98×99×100

2024-11-18 02:55:03
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回答(1):

=1/2-1/3+1/3-1/4+1/4-1/5+……+1/99-1/100 =1-1/100 =99/100