Question

Giúp em với : 3/4+2/7+1/4+3/5+5/7=...  ( / là phần)

 

Answer 1

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

= (3/4 + 1/4) + (2/7 + 5/7) + 3/5

= 1 + 1 + 3/5

= 2 + 3/5

= 10/5 + 3/5

= 13/5.

Answer 2

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

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

\(=1+1+\frac{3}{5}\)

\(=2+\frac{3}{5}\)

\(=\frac{13}{5}\)