A=(5-0).1.2.3.4+(6-1).2.3.4.5+...+(101-96).97.98.99.100
A=1.2.3.4.5-0+2.3.4.5.6-1.2.3.4.5+...+97.98.99.100.101-96.97.98.99.100
A=97.98.99.100.101=9505049400
A=1901009880
1.2+2.3+3.4+4.5+...+99.100
S=1+2+2^2+2^3+2^4+...+2^100
S=1.2+2.3+3.4+4.5+...+99.100+100.101
Q=1^2+2^2+3^2+...+100^2+101^2
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=?
c=1.2+2.3+3.4+4.5..............+99.100
1.2+2.3+3.4+4.5+...+98.99+99.100=?
S=1.2+2.3+3.4+4.5+........+99.100
