CMR: 1/101 + 1/102 + 1/203 + ... + 1/200 > 13/14
CMR:
a, 101 x 102 x 103 x..x 200 chia hết cho 1 x 3 x 5 x...x 199.
b, 201 x 202 x 203 x...x 600 chia hết cho 3200
CMR:1/101+1/102+1/103+...+1/200=1-1/2+1/3-1/4+...+1/199-1/200
CMR : ( 1 + 1/3 + 1/5 + ...+ 1/99 ) + ( 1/2 + 1/4+ ..1/200 ) = 1/101 + 1/102+..+1/200
CMR: 1-1/2+1/3-1/4+...+1/199-1/200=1/101+1/102+1/103+...+1/200
CMR:
1-1\2+1\3-1\4+.....+1\199-1\200=1\101+1\102+.....+1\200
A= 1/101+1/102+1/103+.....+1/200 cmr 7/12<A<1
cmr \(\dfrac{1}{101}+\dfrac{1}{102}+\dfrac{1}{103}+...+\dfrac{1}{199}+\dfrac{1}{200}>\dfrac{1}{2}\)
chứng minh rằng
a,1\101+1\102+...+1\199+1\200 <1
b,1\101+1\102+...+1\149+1\150>1\3
c,1\101+1\102+...+1\199+1\200>7\12
