Question

Tính giá trị biểu thức

A = -5,13 : (5\(\dfrac{5}{28}\) - 1\(\dfrac{8}{9}\) x 1,25 + 1\(\dfrac{16}{63}\) )

B = ( 3\(\dfrac{1}{3}\) x 1,9 + 19,5 : 4\(\dfrac{1}{3}\) ) x ( \(\dfrac{62}{75}\)- \(\dfrac{4}{25}\) )

Giúp nha

Answer 1

a) \(A=-5,13:\left(5\dfrac{5}{28}-1\dfrac{8}{9}.1,25+1\dfrac{16}{63}\right)\)

\(\Leftrightarrow A=-5,13:\left(5\dfrac{5}{28}-\dfrac{85}{36}+1\dfrac{16}{63}\right)\)

\(\Leftrightarrow A=-5,13:\left(\dfrac{355}{126}+1\dfrac{16}{63}\right)\)

\(\Leftrightarrow A=-5,13:\dfrac{57}{14}\)

\(\Leftrightarrow A=\dfrac{-63}{50}\)

b) \(B=\left(3\dfrac{1}{3}.1,9+19,5:4\dfrac{1}{3}\right).\left(\dfrac{62}{75}-\dfrac{4}{25}\right)\)

\(\Leftrightarrow B=\left(\dfrac{19}{3}+19,5.\dfrac{3}{13}\right).\dfrac{2}{3}\)

\(\Leftrightarrow B=\left(\dfrac{19}{3}+\dfrac{9}{2}\right).\dfrac{2}{3}\)

\(\Leftrightarrow B=\dfrac{65}{6}.\dfrac{2}{3}\)

\(\Leftrightarrow B=\dfrac{65}{9}\)