\(=\dfrac{\left(100+1\right)\left(100-1+1\right)}{2}=\dfrac{100\cdot101}{2}=5050\)
\(=\dfrac{\left(100+1\right)\left(100-1+1\right)}{2}=\dfrac{100\cdot101}{2}=5050\)
1/2 + 2/3 + 3/4 + 4/5 + 5/6 + 6/7 + 7/8 + 8/9 + ........+ 95/96 + 96/97 + 97/98 + 98/99 + 99/100 = ?
a)A=1-2+3-4+...+99-100
b)B=1-2-3+4+5-6-7+...+97-98-99+100
c)C=2100-299s-998-...-22-2-1
giup mik vs a
Tính A= 2^3+ 4^3+ 6^3+ ...+98^3+ 100^3
B= 1^3+ 3^3+ 5^3+ ...+97^3+ 99^3
C= 1^3+ 2^3- 3^3+ 4^3- 5^3+ 6^3- ...+98^3- 99^3+ 100^3
Tính tổng
A=\(1^3+2^3+3^3+...+100^3\)
B=\(2^3+4^3+...+98^3\)
C=\(1^3+3^3+5^3+...+99^3\)
D=\(1^3-2^3+3^3-4^3+...+99^3-100^3\)
Tính:C=1×2×3+2×3×4+3×4×5+...+98×99×100
A= 1/2+2/3+3/4+4/5+............+98/99+99/100
A bằng bao nhiêu
Tính nhanh :B=1*4/2*3+2*5/3*4+...+98*101/99*100
Tính A= 2^3+ 4^3+ 6^3+ ...+98^3+ 100^3
B= 1^3+ 3^3+ 5^3+ ...+97^3+ 99^3
C= 1^3+ 2^3- 3^3+ 4^3- 5^3+ 6^3- ...+98^3- 99^3+ 100^3
Tính
P= 1/1*2*3 + 1/2*3*4 + 1/3*4*5 +........+1/98*99*100