A=1/31+1/32+1/33+...+1/89+1/90
so sánh :
1/31 + 1/32 + 1/33 +.....+1/89 + 1/90 va 5/6
Q=1/31+1/32+1/33+...+1/89+1/90 . So sánh Q với 5/6
A=1/31+1/32+1/33+...+1/89+1/90
So sánh A voi 5/6
Chứng minh
1/31 + 1/32 +1/33 + .....+1/89 +1/90 >5/6
Mọi người giúp mình nha;
so sánh với 5/6:
1/31+1/32+1/33+1/34+.......+1/88+1/89+1/90
Điền dấu < ; > ; =
3\(\dfrac{1}{5}-\dfrac{8}{3}...........\dfrac{17}{5}-2\dfrac{12}{5}\)
\(\dfrac{1}{31}+\dfrac{1}{32}+\dfrac{1}{33}+....+\dfrac{1}{89}+\dfrac{1}{90}\) ..... \(\dfrac{5}{6}\)
1/31 + 1/32 + ... + 1/89 + 1/90
