Question

Giúp mik câu này

5/2 +1/4 -1/2 +3/4-7/2

Answer 1

\(\frac{5}{2}+\frac{1}{4}-\frac{1}{2}+\frac{3}{4}-\frac{7}{2}\)

\(=\left(\frac{5}{2}-\frac{1}{2}\right)+\left(\frac{1}{4}+\frac{3}{4}\right)-\frac{7}{2}\)

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

\(=3-\frac{7}{2}\)

\(=\frac{6}{2}-\frac{7}{2}\)

\(=\frac{-1}{2}\)

Answer 2

-1/2 nhé bn 

Answer 3

\(\frac{5}{2}+\frac{1}{4}-\frac{1}{2}+\frac{3}{4}-\frac{7}{2}\)

\(=\left(\frac{5}{2}-\frac{1}{2}\right)+\left(\frac{1}{4}+\frac{3}{4}\right)-\frac{7}{2}\)

\(=\frac{4}{2}+1-\frac{7}{2}\)

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

\(=3-\frac{7}{2}\)

\(=-\frac{1}{2}\)

Chúc bạn học tốt !