Question

Bài 5: Thực hiện phép tính: M=\(\dfrac{9}{40}\)-\(\dfrac{11}{60}\)+\(\dfrac{13}{84}\)-\(\dfrac{15}{112}\)

 

Answer 1

\(M=\dfrac{9}{40}-\dfrac{11}{60}+\dfrac{13}{84}-\dfrac{15}{112}\)

\(M=\left(\dfrac{90}{40}-\dfrac{11}{60}\right)+\left(\dfrac{13}{84}-\dfrac{15}{112}\right)\)

\(M=\dfrac{27}{120}-\dfrac{22}{120}+\dfrac{52}{336}-\dfrac{45}{336}\)

\(M=\dfrac{5}{120}+\dfrac{7}{336}\)

\(M=\dfrac{1}{24}+\dfrac{1}{48}\)

\(M=\dfrac{3}{48}=\dfrac{1}{16}\)

Answer 2

M=\(\dfrac{9}{40}-\dfrac{11}{60}+\dfrac{13}{84}-\dfrac{15}{112}\)

M=\(\dfrac{1}{24}+\dfrac{13}{84}-\dfrac{15}{112}\)

M=\(\dfrac{11}{56}-\dfrac{15}{112}\)

M=\(\dfrac{1}{16}\)