Ta có : 8.44= 352
41.9= 369
Vậy 8/41 < 9/44
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So sánh: \(\dfrac{2}{23}và\dfrac{9}{41}\)
Tính nhanh:
\(\dfrac{5}{13}+\dfrac{5}{17}+\dfrac{-20}{41}+\dfrac{8}{13}+\dfrac{-21}{41}\)
So sanh AvaB
Adfrac{20}{39}+dfrac{22}{27}+dfrac{18}{43},Bdfrac{14}{39}+dfrac{22}{29}...
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So sanh AvaB
A=\(\dfrac{20}{39}+\dfrac{22}{27}+\dfrac{18}{43},B=\dfrac{14}{39}+\dfrac{22}{29}+\dfrac{18}{41}\)
So sánh A và B :
a) Adfrac{20}{39}+dfrac{22}{27}+dfrac{18}{43}
Bdfrac{14}{39}+dfrac{22}{29}+dfrac{18}{41}
b) Adfrac{3}{8^3}+dfrac{7}{8^4}
Bdfrac{7}{8^3}+dfrac{3}{8^4}
c) Adfrac{10^7+5}{10^7-8}
Bdfrac{10^8+6}{10^8-7}
d) Adfrac{10^{1992}+1}{10^{1991}+1}
Bdfrac{10^{1993}+1}{10^{1992}+1}
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So sánh A và B :
a) \(A=\dfrac{20}{39}+\dfrac{22}{27}+\dfrac{18}{43}\)
\(B=\dfrac{14}{39}+\dfrac{22}{29}+\dfrac{18}{41}\)
b) \(A=\dfrac{3}{8^3}+\dfrac{7}{8^4}\)
\(B=\dfrac{7}{8^3}+\dfrac{3}{8^4}\)
c) \(A=\dfrac{10^7+5}{10^7-8}\)
\(B=\dfrac{10^8+6}{10^8-7}\)
d) \(A=\dfrac{10^{1992}+1}{10^{1991}+1}\)
\(B=\dfrac{10^{1993}+1}{10^{1992}+1}\)
Chứng minh A > B, biết A = \(\dfrac{2}{5.7}+\dfrac{5}{7.12}+\dfrac{7}{12.19}+\dfrac{9}{19.28}+\dfrac{11}{28.39}+\dfrac{1}{39.40}\)
B = \(\dfrac{1}{20}+\dfrac{1}{44}+\dfrac{1}{77}+\dfrac{1}{119}+\dfrac{1}{170}\)
tìm x:
a) \(-8:\left(4\dfrac{1}{5}x+\dfrac{3}{10}\right)=4\dfrac{4}{9}\)
b) \(4\dfrac{2}{3}-\left(\dfrac{3}{5}:x\right)=-20\%\)
c) \(\left(\dfrac{13}{10}x-15\right).-\dfrac{5}{14}=3\)
d) \(\left(5,5x-44\right):\left(-\dfrac{3}{2}\right)=30\)
e) \(\dfrac{11}{14}:\left(2x+\dfrac{5}{7}\right)=-\dfrac{11}{18}\)
So Sánh
a)\(\dfrac{179}{197}\)và\(\dfrac{197}{917}\)
b)\(\dfrac{183}{184}\)và\(\dfrac{-184}{-183}\)
c)\(\dfrac{29}{40};\dfrac{28}{41};\dfrac{29}{41}\)
d) \(S=\dfrac{1}{51}+\dfrac{1}{52}+...+\dfrac{1}{100}\)với \(\dfrac{1}{2}\)
Làm ngay nhé
I tính
1,\(\dfrac{3}{4}.\dfrac{8}{9}.\dfrac{15}{16}.\dfrac{24}{25}.\dfrac{35}{36}.\dfrac{48}{49}.\dfrac{63}{64}\)
2, 1,2+2,3+......+8,9+9,10+10,11+......+98,99+100,101+......+998,999
3, 1,2+2,4+3,6+4,8+5,10+6,12+....+45,90
4, 1,1+1,11+1,111+......+1,111....11+1,11111....111
(9 số 1) (10 so 1)
\(Tính: B = \dfrac{2 - \dfrac{2}{19} + \dfrac{2}{43} - \dfrac{2}{2017}}{3 - \dfrac{3}{19} + \dfrac{3}{43} - \dfrac{3}{2017}} :\dfrac{4 - \dfrac{4}{29} + \dfrac{4}{41} - \dfrac{4}{2018}}{5 - \dfrac{5}{29} + \dfrac{5}{41} - \dfrac{5}{2018}} \)