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26 . 87 - 17 . 69 + 13 . 26 - 17 . 31
= 26 . ( 87 + 13 ) - 17 . ( 69 + 31 )
= 26 . 100 - 17 . 100
= 26 - 17
= 9
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a. \(-0,8-\dfrac{7}{13}\cdot\dfrac{26}{39}=-\dfrac{4}{5}-\dfrac{14}{39}=-\dfrac{156}{195}-\dfrac{70}{195}=-\dfrac{226}{195}\)
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\(\dfrac{11}{15}+\dfrac{7}{13}-\left(\dfrac{13}{15}+\dfrac{7}{13}\right)\)
\(=\dfrac{11}{15}+\dfrac{7}{13}-\dfrac{13}{15}-\dfrac{7}{13}\)
\(=\left(\dfrac{11}{15}-\dfrac{13}{15}\right)+\left(\dfrac{7}{13}-\dfrac{7}{13}\right)\)
\(=\dfrac{-2}{15}+0\)
\(=\dfrac{-2}{15}\)
#DatNe
= 11/15+7/13-13/15+7/13
= (11/15-13/15) + 7/13
= (-2/15)+7/15
= 5/15
= 1/3
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\(\dfrac{6}{13}.\dfrac{5}{7}+\dfrac{6}{13}.\dfrac{2}{7}+\dfrac{7}{13}=\dfrac{6}{13}.\left(\dfrac{5}{7}+\dfrac{2}{7}\right)+\dfrac{7}{13}=\dfrac{6}{13}.1+\dfrac{7}{13}=\dfrac{6}{13}+\dfrac{7}{13}=\dfrac{13}{13}=1\)
#Monster
\(\dfrac{6}{13}\).(\(\dfrac{2}{7}+\dfrac{5}{7}\))+\(\dfrac{7}{13}\)
\(\dfrac{6}{13}\).1+\(\dfrac{7}{13}\)
\(\dfrac{6}{13}\)+\(\dfrac{7}{13}\)
1
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