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2/1+6/1+12/1+----------462/1的值简便运算
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2/1+6/1+12/1+----------462/1的值 简便运算
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答案和解析
=1/1×2+1/2×3+1/3×4+1/4×5+……+1/21×22
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+……+1/21-1/22
=1-1/22
=21/22
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+……+1/21-1/22
=1-1/22
=21/22
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