3S=1.2(3-0)+2.3(4-1)+...+99.100.(101-98)
=1.2.3-0.1.2+2.3.4-1.2.3+4.5.6-2.3.4+...+99.100.101-98-99-100
=99.100.101
S=33.100.101
=333300
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3S=1.2(3-0)+2.3(4-1)+...+99.100.(101-98)
=1.2.3-0.1.2+2.3.4-1.2.3+4.5.6-2.3.4+...+99.100.101-98-99-100
=99.100.101
S=33.100.101
=333300
C=1.2+2.3+3.4+4.5+5.6+...+99.100
1.2+2.3+3.4+4.5+...+99.100
1.2 + 2.3 + 3.4 + 4.5 + ... + 99.100
1.2+2.3+3.4+4.5+...+99.100 = ?
Tính tổng: S = 1.2 + 2.3 + 3.4 + 4.5 + ... + 99.100.
A=1.2+2.3+3.4+4.5+...+99.100=?
1.2+2.3+3.4+4.5+...+98.99+99.100=?
1.2+2.3+3.4+4.5...+99.100+101
S=1.2+2.3+3.4+4.5+........+99.100