\(B=\frac{\frac{8}{9}+\frac{8}{10}+\frac{8}{11}+...+\frac{8}{100}}{\frac{1}{45}+\frac{1}{50}+\frac{1}{55}+...+\frac{1}{500}}\)
\(=\frac{8\left(\frac{1}{9}+\frac{1}{10}+\frac{1}{11}+...+\frac{1}{100}\right)}{\frac{1}{5}\left(\frac{1}{9}+\frac{1}{10}+\frac{1}{11}+...+\frac{1}{100}\right)}\)
\(=\frac{8}{\frac{1}{5}}\)
\(=\frac{8.5}{1}\)
\(=40\)
Tính hợp lý
\(A= (\dfrac{92-\dfrac{1}{9}-\dfrac{2}{10}-\dfrac{3}{11}-...-\dfrac{91}{99}-\dfrac{92}{100}}{\dfrac{1}{45}+\dfrac{1}{50}+\dfrac{1}{55}+...+\dfrac{1}{495}+\dfrac{1}{500}}\) B= \(\dfrac{\dfrac{1}{2}+\dfrac{1}{3}+\dfrac{1}{4}+...+\dfrac{1}{8}+\dfrac{1}{9}+\dfrac{1}{10}}{\dfrac{1}{9}+\dfrac{2}{8}+\dfrac{3}{7}+...+\dfrac{8}{2}+\dfrac{9}{1}})\)
(92-1/9-2/10-3/11-...-92/100)/(1/45+1/50+1/55+...+1/500)
tính [92-1/9-2/10-3/11-...-92/100]:[1/45+/50+1/55+...+1/500]
a) So sánh: -22/45 và -51/103
b) Tính:
( 92 - 1/9 - 2/10 - 3/11 - ... - 92/100 ) : ( 1/45 + 1/50 + 1/55 + ... + 1/500 )
tính :
(92 -1/9 -2/10 -3/11 -..... -92/100 ) :(1/45 +1/50 +1/55 +..... +1/500)
Cho E=92-1\9-2\10-3\11-...-92\100; F=1\45+1\50+1\55+...+1\500
Tính E/F
cho M=92-1/9-2/10-3/11-...-92/100
N=1/45=1/50+1/55+...+1/500
tính M.N
Tính:\(B=\frac{92-\frac{1}{9}-\frac{2}{10}-\frac{3}{11}-.....-\frac{92}{100}}{\frac{1}{45}+\frac{1}{50}+\frac{1}{55}+....+\frac{1}{500}}\)
Tính tỉ số phần trăm của
A= 1/99 +2/98 +3/97 +...+99/1 / 1/2 +1/3 +1/4 +...+1/100
và B= 99 -1/9 -2/10 -3/11 -...-92/100 / 1/45 +1/50 +1/55 +...+1/500
