A=1+2.2!+3.3!+4.4!+...+100.100!
tinh : A = (1 - 1/2.2) . (1 - 1/3.3) . (1 - 1/4.4)...(1 -1/100.100)
1/2.2+1/3.3+1/4.4+....+1/100.100<1
Chứng minh rằng : 1/2.2+1/3.3+...+1/100.100<1
Chứng minh A=1/2.2+1/4.4+1/6.6+............+1/100.100<1/2
Chung minh M<3/4
1/3.3+1/4.4+1/5.5...+1/100.100<1/2 ( chứng minh)
CMR: 1/2.2 +1/3.3+1/4.4+....+1/100.100<1
Mik cần gấp
Chứng minh : 1/2.2+1/3.3+......+ 1/100.100<1
