so sanh
a)-22/45 va -51/101
b)so sanh A=\(\frac{^{2009^{2009}}+1}{^{2009^{20010}}+1}\)va B=\(\frac{2009^{2010}-2}{2009^{2011}-2}\)
cho A=1/1*2+1/3*4+...+1/99.100
B=7/2
C=5/6
so sanh A&B va so sanh A& C
cho a=(1-1/2)*(1-1/3)*(1-1/4)*...(1-1/19)*(1-1/20)
b=(1-1/4)*(1-1/9)*(1-1/16)*...*(1-1/18)*(1-1/180)
so sanh a va 1/21
so sanh b va 11/21
cho tam giac abc, goc A tu, tren canh BC lay diem M, N sao cho BN=BA, CM=CA
a, so sanh goc AMC va ANB
b, so sanh canh AM va AN
c, biet goc ABC =40 do, goc ACB =30 do , tinh so do 3 goc cua tam giac AMN
Cho tam giac ABC co goc A = 90 do. Ve Tia phan giac Bd cua goc B ( D thuoc AC ). Tren canh BC lay E cho BE = BA
a) so sanh do dai doan AD va DE, so sanh goc EDC va ABC
b) cm AE vuong goc voi BD
Cho A= 1+2+2^2+2^3+.....+2^10. So sanh A va 2^11
tinh va so sanh :
a)(2.5)^2 va 2^2.5^2
cho A=1+1/2+1/3+1/4+.......+1/4026 va B=1+1/3+1/5+........+1/4025
so sanh A/B va 1/2013/2014
cho A=1/2.3/4.5/6........99/100 va B=2/3.4/5.5/6.........100/101 so sanh A va B
