Tính s = 6 + 16 + 30 +48 + ... +19600 +19998
M=1.3+2.4+3.5+...99.101
Hãy viết cong thuc tổng quát của m
A=1.4+2.5+3.6+...+99.102
B=1+3+6+10+...+4851+4950
C=6+16+30+48+...+19600+19998
Tính :
C = 6 + 16 + 30 + 48 + ........... + 19600 + 19998
Tính:
A3 = 4+12+24+40+...+760
A4 = 6+16+30+48+...+19600+19998
A5 = 14.3+6+10+...+4851+4950
6+16+30+48+...+19600+19998
6+16+30+48+....+19600+19998
A=6+16+30+48+...+19600+19998
D= 6+16+30+48+....+19600+19998
tinh A=6+16+30+48+...19600+19998