tinh nhanh:-5/9.-6/13+5/-9.-5/13-5/9
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NV
0
24 tháng 3 2021
\(A,\dfrac{7}{11}+\dfrac{5}{6}-\dfrac{-4}{11}-\dfrac{1}{6}\)
\(= (\dfrac{7}{11}+\dfrac{-4}{11})-(\dfrac{5}{6}-\dfrac{1}{6})\)
\(=\dfrac{3}{11}-\dfrac{2}{3}\)
\(= \dfrac{9}{33}-\dfrac{22}{33}\)
\(= \dfrac{-13}{33}\)
\(B,\dfrac{5}{9}.\dfrac{7}{3}+\dfrac{5}{9}.\dfrac{9}{13}-\dfrac{5}{9}:\dfrac{13}{5}\)
\(=(\dfrac{5}{9}.\dfrac{5}{9}:\dfrac{5}{9}).\dfrac{7}{3}+\dfrac{9}{13}-\dfrac{13}{5}\)
\(=(\dfrac{5}{9}.\dfrac{7}{3})+(\dfrac{9}{13}-\dfrac{13}{5})\)
\(=(\dfrac{5}{9}.\dfrac{21}{9})+(\dfrac{45}{65}-\dfrac{169}{65})\)
\(=\dfrac{35}{27}+\dfrac{-124}{65}\)
\(=\dfrac{2275}{1755}+\dfrac{-3348}{1755}\)
\(=\dfrac{-1073}{1755}\)
MH
1
QD
0
VD
1
27 tháng 12 2017
= ( 5/7 + 9/7 ) + ( 7/13 + 19/13 ) + ( 6/5 + 9/5 )
= 14/7 + 26/13 + 15/5
= 2 + 2 + 3
= 7
k cho mk và kb với mik nhé
15 tháng 5 2015
ta có \(\frac{\frac{4}{5}-\frac{4}{11}+\frac{4}{13}}{\frac{9}{5}-\frac{9}{11}+\frac{9}{13}}+\frac{\frac{5}{7}+\frac{5}{11}-\frac{5}{13}}{\frac{9}{7}+\frac{9}{11}-\frac{9}{13}}\)
\(=\frac{4\left(\frac{1}{5}-\frac{1}{11}+\frac{1}{13}\right)}{9\left(\frac{1}{5}-\frac{1}{11}+\frac{1}{13}\right)}+\frac{5\left(\frac{1}{7}+\frac{1}{11}-\frac{1}{13}\right)}{9\left(\frac{1}{7}+\frac{1}{11}-\frac{1}{13}\right)}\)
\(=\frac{4}{9}+\frac{5}{9}=\frac{9}{9}=1\)
NT
5
14 tháng 6 2018
\(\frac{5}{7}+\frac{7}{13}+\frac{19}{13}+\frac{6}{5}+\frac{9}{7}+\)\(\frac{9}{5}\)
\(=\left(\frac{5}{7}+\frac{9}{7}\right)+\left(\frac{7}{13}+\frac{19}{13}\right)+\left(\frac{6}{5}+\frac{9}{5}\right)\)
\(=2+2+3\)
\(=7\)
14 tháng 6 2018
a, 5/7+7/13+19/13+6/5+9/7+9/5
= (5/7 + 9/7) + ( 7/13 + 19/13) + ( 6/5 + 9/5)
= 2 + 2 + 3
= 7
ST
1
27 tháng 11 2015
4+5+6+7+8+9+10+11+12+13+14+15+16
= (4+16)+(5+15)+(7+13)+(8+12)+(9+11)+10
=20+20+20+20+20+10
=110
tick nha
\(\dfrac{-5}{9}\).\(\dfrac{-6}{13}\)+\(\dfrac{-5}{9}\).\(\dfrac{-5}{13}\)-\(\dfrac{5}{9}\)
=\(\dfrac{-5}{9}\).(\(\dfrac{-6}{13}\)+\(\dfrac{-5}{13}\)+1)
=\(\dfrac{-5}{9}\).(\(\dfrac{-11}{13}\)+1)
=\(\dfrac{-5}{9}\).\(\dfrac{2}{13}\)
=\(\dfrac{-10}{117}\)