Question

tinh bang cach thuan tien 

a, 12 phan 25 + 3 phan 5 + 13 phan 25

b, 3 phan 2 + 2 phan 3 + 4 phan 3

c, 3 phan 5 + 7 phan 5 + 3 phan 4

Answer 1

a, \(\frac{12}{25}+\frac{3}{5}+\frac{13}{25}\)

\(=\left(\frac{12}{25}+\frac{13}{25}\right)+\frac{3}{5}\)

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

\(=\frac{8}{5}\)

b, \(\frac{3}{2}+\frac{2}{3}+\frac{4}{3}\)

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

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

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

c, \(\frac{3}{5}+\frac{7}{5}+\frac{3}{4}\)

\(=2+\frac{3}{4}\)

\(=\frac{11}{4}\)

nhớ ấn đúng giùm tớ nha

Answer 2

a) = 8 phần 5

b) = 7 phần 2

c) = 11 phần 4

nhớ ấn giùm tớ nha