M=1/2.2/3.3/4.4/5.......99/100 .Cmr 1/15<M<1/110
A =1.1+ 2.2+ 3.3+ 4.4+ ..... +99.99+ 100.100
tính s
s1=3+7+11+...+2015
s2=1+2+4+5+7+8+...+100+101
s3=1.1+2.2=3.3+...+99.99
Tính nhanh 1.1 + 2.2 + 3.3 + 4.4 + ............ + 99.99
Help
A.2.2+4.4+6.6+8.8+...+100.100
B.1.1+3.3+5.5+...+99.99
Tính: 1/100 - 1/100.99 - 1/99.99 - ... - 1/3.2 - 1/ 2.2 = ?
tính : A= 1/2.2+1/3.3+1/4.4+...+1/9.9
B=2/3.3+2/5.5+2/7.7+...+2/2007.2007
C=1/4.4+1/6.6+1/8.8+...+1/2006.2006
tinh : A = (1 - 1/2.2) . (1 - 1/3.3) . (1 - 1/4.4)...(1 -1/100.100)
1.1 ! + 2.2 ! + 3.3 ! + 4.4 ! + .... + 99.99 ! + 100.100 !
giúp mình với ai làm nhanh mình tick cho