Hướng dẫn:
A = 1.2+2.3+3.4+4.5+...+98.99+99.100
A= 666600
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Hướng dẫn:
A = 1.2+2.3+3.4+4.5+...+98.99+99.100
A= 666600
A=4+12+24+40+...19404+19800
a=4+12+24+40+...+19404+19800
A=4+12+24+40+...+19404+19800
Tính :
A = 4 + 12 + 24 + 40 + .......+ 19404 + 19800 .
tinhA=4+12+24+40+v.v...+19404+19800
A=?
4+12+24+40+...+19404+19800=???
4+12+24+40+...+19404+19800
4+12+24+40+...+19404+19800
B=4+12+24+40+...+ 19404+19800