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A = \(-\frac{513}{100}:\left(\frac{145}{4.7}-\frac{17}{9}.\frac{5}{4}+\frac{79}{7.9}\right)=-\frac{513}{100}:\frac{145.9-17.5.7+79.4}{4.7.9}=-\frac{513}{100}:\frac{57}{14}\)
A = \(-\frac{513}{100}.\frac{14}{57}=\frac{-63}{50}\)
a)\(-\frac{5}{13}:\left(\frac{145}{28}-\frac{17}{9}.\frac{5}{4}+\frac{79}{63}\right)\)
\(=-\frac{5}{13}:\left(\frac{145}{28}-\frac{85}{36}+\frac{79}{63}\right)\)
\(=-\frac{5}{13}:\left(\frac{145}{28}-\frac{31}{28}\right)\)
\(=-\frac{5}{13}:\frac{57}{14}\)
\(=-\frac{70}{741}\)
\(A=-5,13:\left(5\dfrac{5}{28}-1\dfrac{8}{9}.1,25+1\dfrac{16}{63}\right)\)
\(=-5,13:\left(5\dfrac{5}{28}-2\dfrac{13}{36}+1\dfrac{16}{63}\right)\)
\(=5,13:\left[\left(5-2+1\right)+\left(\dfrac{5}{28}-\dfrac{13}{36}+\dfrac{16}{63}\right)\right]\)
\(=5,13:\left(4+\dfrac{1}{14}\right)\)
\(=1,26\)
A= -5,13: (\(5\dfrac{5}{28}\)-\(1\dfrac{8}{9}\).1,25+\(1\dfrac{16}{63}\))
A=-5,13:(\(\dfrac{145}{28}\)-\(\dfrac{17}{9}\). 1,25+\(\dfrac{79}{63}\))
A= -5,13:(\(\dfrac{145}{28}\)-\(\dfrac{85}{36}\)+ \(\dfrac{79}{63}\))
A= -5,13:\(\dfrac{57}{14}\)
A= -\(\dfrac{63}{50}\)
Lời giải:
$M=-5,13(5+\frac{5}{28}-2-\frac{1}{9}-1,25+1+\frac{16}{69})$
$=-5,13.\frac{8837}{2898}=-15,643$
\(=-5.13:\dfrac{16}{3}=-\dfrac{513}{100}\cdot\dfrac{3}{16}=\dfrac{-1539}{1600}\)