Question

Tính bằng 2 cách:

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

 

Answer 1

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

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

\(=-2+2-\frac{5}{2}\)

\(=-\frac{5}{2}\)

Cách 2 là bạn tính trong ngoặc trước ,ngoài ngoạc sau (tự làm nhé)

Answer 2

Làm tiếp cách 2 Secret Person

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

\(A=\left(\frac{36}{6}-\frac{4}{6}+\frac{3}{6}\right)-\left(\frac{150}{30}+\frac{50}{30}-\frac{45}{30}\right)-\left(\frac{18}{6}-\frac{14}{6}+\frac{15}{6}\right)\)

\(A=\frac{35}{6}-\frac{155}{30}-\frac{19}{6}\)

\(A=\frac{175}{30}-\frac{155}{30}-\frac{95}{30}\)

\(A=-\frac{5}{2}\)