Question

a= ( 6-2/3+1/2)-(5+5/3-3/2)-( 3-7/3+5/2)

Answer 1

\(=\left(6-\dfrac{2}{3}+\dfrac{1}{2}\right)-\left(5+\dfrac{5}{3}-\dfrac{3}{2}\right)-\left(3-\dfrac{7}{3}+\dfrac{5}{2}\right)\)

\(=\left(\dfrac{16}{3}+\dfrac{1}{2}\right)-\left(\dfrac{20}{3}-\dfrac{3}{2}\right)-\left(\dfrac{2}{3}+\dfrac{5}{2}\right)\)

\(=\dfrac{35}{6}-\dfrac{31}{6}-\dfrac{19}{6}\)

\(=\dfrac{2}{3}-\dfrac{19}{6}\)

\(=\dfrac{-15}{6}\)

Answer 2

(163+12)−(203−32)−(23+52)=(163+12)−(203−32)−(23+52)

23−196=23−196

Answer 3

Lời giải:

\(a=6-\frac{2}{3}+\frac{1}{2}-5-\frac{5}{3}+\frac{3}{2}-3+\frac{7}{3}-\frac{5}{2}\)

\(=(6-5-3)+(\frac{7}{3}-\frac{2}{3}-\frac{5}{3})+(\frac{1}{2}+\frac{3}{2}-\frac{5}{2})=-2+0+\frac{-1}{2}=-(2+\frac{1}{2})=\frac{-5}{2}\)