A=1/101+1/102+1/103+...1/200 chung minh rang 5/8<A<3/4
chung minh rang
a)1/101+1/102+1/103+...+1/200<7/12
chung minh rang
A= 1/10 + 1/11 +.......+ 1/100 < 1
B = 1/100 + 1/102 + 1/ 103 + ..........+ 1/300 > 2/3
tính A:B bt A=1/1*300+1/2*301+...+101*400
B=1/1*102+11/2*103+...+1/299*400
cho A =1/101+1/102+1/103+...+1/200
CHUNG TO RANG
A)A>7/12
B) A>5/8
chung minh rang
\(1-\frac{1}{2}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{199}-\frac{1}{200}=\frac{1}{101}+\frac{1}{102}+\frac{1}{103}+...+\frac{1}{200}\)
giup minh minh like cho nho giai chi tiet mot chut nhe
cho s biet:1/101+1/102+....+1/130. chung minh rang 1/4<s<91/330
chung minh rang 1-1/2+1/3-1/4+.....+1/199-1/200=1/101+1/102+.....+1/200
Chung minh rang:
a,1-1/2+1/3-1/4+...+1/199-1/200=1/101+1/102+...+1/200
