cm 1<A*A<4
cm 1<A*A<4
So sánh:
A=10001001
B=11+22+33+.....+10001001
CHO : A= 1/1*2+1/3*4+...+1/1997*1998
VA B= 1/1000*1998+1/1001*1997+...+1/1998*1000
CHUNG MINH RANG A/B LA SO NGUYEN
SO SÁNH
A=10001001
B=11+22+33+44+...+10001000
So sánh A và B:
A=10001001
B=11+22+33+.....+10001000
so sánh 2 số sau:
A=10001001
B= 11+22+33+44+.....+10001000
so sánh 2 số sau:
A=10001001
B= 11+22+33+44+.....+10001000
So sánh 2 số sau
A=10001001
B=11+22+33+......+10001000
Cho A=2^1+2^2+2^3+2^4+...+2^1000+2^1001
tìm A
Chứng minh: 1/1000+1/1001+...+1/2000>1/2