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Thôi, để mk giải chi tiết cho, không lại bảo mk lười:
A=\(\dfrac{18}{26}+\dfrac{-5}{27}+\dfrac{-22}{86}+\dfrac{12}{39}+\dfrac{-32}{43}\)
A=\(\dfrac{9}{13}+\dfrac{-5}{27}+\dfrac{-11}{43}+\dfrac{4}{13}+\dfrac{-32}{43}\)
A=\(\left(\dfrac{9}{13}+\dfrac{4}{13}\right)+\left(\dfrac{-11}{43}+\dfrac{-32}{43}\right)+\dfrac{-5}{27}\)
A= 1+(-1)+\(\dfrac{-5}{27}\)
A=0+\(\dfrac{-5}{27}\)
A=\(\dfrac{-5}{27}\)
B=\(\dfrac{-10}{12}+\dfrac{8}{15}+\dfrac{-19}{56}+\dfrac{-3}{18}+\dfrac{28}{60}\)
B=\(\dfrac{-5}{6}+\dfrac{8}{15}+\dfrac{-19}{56}+\dfrac{-1}{6}+\dfrac{7}{15}\)
B=\(\left(\dfrac{-5}{6}+\dfrac{-1}{6}\right)+\left(\dfrac{8}{15}+\dfrac{7}{15}\right)+\dfrac{-19}{56}\)
B= -1+1+\(\dfrac{-19}{56}\)
B=0+\(\dfrac{-19}{56}\)
B=\(\dfrac{-19}{56}\)
Ôi mỏi quá! Chúc bạn học tốt !
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A = \(\dfrac{18}{26}\) + (-\(\dfrac{5}{27}\)) + (-\(\dfrac{22}{86}\)) + \(\dfrac{12}{39}\) - \(\dfrac{32}{43}\)
A = \(\dfrac{9}{13}\) - \(\dfrac{5}{27}\) - \(\dfrac{11}{43}\) + \(\dfrac{4}{13}\) - \(\dfrac{32}{43}\)
A = (\(\dfrac{9}{13}\) + \(\dfrac{4}{13}\)) - (\(\dfrac{11}{43}\) + \(\dfrac{32}{43}\)) - \(\dfrac{5}{27}\)
A = \(\dfrac{13}{13}\) - \(\dfrac{43}{43}\) - \(\dfrac{5}{27}\)
A = 1 - 1 - \(\dfrac{5}{27}\)
A = 0 - \(\dfrac{5}{27}\)
A = - \(\dfrac{5}{27}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
A = 18/26 + -5/27 + -22/86 + 12/39 + -32/43
A = 9/13 + -5/27 + -11/43 + 4/13 + -32/43
A = -5/27 + ( 9/13 + 4/13 ) + ( -11/43 + -32/43 )
A = -5/27 + 1 + ( -1)
A = -5/27 + 0
A = 0
B = -10/12 + 8/15 + -19/56 + 3/-18 + 28/60
B = -5/6 + 8/15 + -19/56 + -1/6 + 7/15
B = -19/56 + ( -5/6 + -1/6 ) + ( 8/15 + 7/15 )
B = -19/56 + ( -1 ) + 1
B = -19/56 + 0
B = 0
![](https://rs.olm.vn/images/avt/0.png?1311)
A=1826+−527+−2286+1239+−32431826+−527+−2286+1239+−3243
A=913+−527+−1143+413+−3243913+−527+−1143+413+−3243
A=(913+413)+(−1143+−3243)+−527(913+413)+(−1143+−3243)+−527
A= 1+(-1)+−527−527
A=0+−527−527
A=−527−527
B=−1012+815+−1956+−318+2860−1012+815+−1956+−318+2860
B=−56+815+−1956+−16+715−56+815+−1956+−16+715
B=(−56+−16)+(815+715)+−1956(−56+−16)+(815+715)+−1956
B= -1+1+−1956−1956
B=0+−1956−1956
B=−1956
mình chỉ biết làm nhiêu đó thôi! Chúc bạn học tốt!
![](https://rs.olm.vn/images/avt/0.png?1311)
xét A và B,ta thấy:
20/39>14/39
22/27>22/29
18/43<18/41
Ta có: 20/39+22/27>14/39+22/29
2012^2013+2013^2013<2013^2013+2013^2014
xet A va B ta thay:
20/39>14/39
22/27>22/29
18/43<18/41
vay A>B