S=1.3+3.5+5.7+....+97.99
S=(1+3+5+7+......+97).(3+5+7+........+99)
S=1+99+(3+5+7+......+97).2
S= 1+99+2400 .2
S=1+99+ 4800
S=100+4800
S=4900
Nhớ tick cho mình nha
Tinh: A= 1.3 + 3.5 + 5.7 + ...+ 97.99
Tính tổng:
A= 2/1.3 +2/3.5 +2/5.7 +......+2/97.99
Tính tổng: \(\frac{1}{1.3}+\frac{1}{3.5}+\frac{1}{5.7}+...+\frac{1}{97.99}\)
giúp mik vs, ai nhanh tick luôn nè:)))
1)Tính tổng 1.3+2.4+3.5+...+97.99+98.1001.3+2.4+3.5+...+97.99+98.100
a) 1/1.3+1/3.5+1/5.7
b) 1/1.3+1/3.5+1/5.7+...+1/2007.2009+1/2009.2011
1/3.5+1/5.7+1/7.9+...+1/97.99 = ?
D= 2/(1.3) + 2/(3.5) + ... + 2/(97.99)
C=1.3+3.5+5.7+...+99.101
2/1.3+14/3.5+34/5.7+.......+322/17.19 =?
