问题描述:
1.1 1 1 1
------ + -----+------+...+ -------
1×2 2×3 3×4 99×100
2.1 1 1 1 1 1 1 1
-- + --- + --- + --- + --- + —— +—— +——
3 6 10 15 21 28 36 45
3.1+3+5+.+17+19
——————————
2+4+6.+18+20
4.135×271+136
------------
136×271-135
5.1 3 2 5 7 9 10 11 19
--- + ---- + ---- + ---- + ---- + ---- + ---- + --- + ---
3 4 5 7 8 20 21 24 35
6.1 1 1 1 1 1
--- + --- + ---- +--- + ---- + ---
2 6 12 20 30 42
------ + -----+------+...+ -------
1×2 2×3 3×4 99×100
2.1 1 1 1 1 1 1 1
-- + --- + --- + --- + --- + —— +—— +——
3 6 10 15 21 28 36 45
3.1+3+5+.+17+19
——————————
2+4+6.+18+20
4.135×271+136
------------
136×271-135
5.1 3 2 5 7 9 10 11 19
--- + ---- + ---- + ---- + ---- + ---- + ---- + --- + ---
3 4 5 7 8 20 21 24 35
6.1 1 1 1 1 1
--- + --- + ---- +--- + ---- + ---
2 6 12 20 30 42
问题解答:
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