Question

mik ghi hơi sai để mn ko nha nhầm lẫn 

thực hiện phép tính

a) 3/4 + 2/5

b) 7/4 - 1/2 

c) 4/9 x 6/8

d) 14/5 : 7/8

Answer 1

a)\(\frac{3}{4}+\frac{2}{5}=\frac{15}{20}+\frac{8}{20}=\frac{23}{20}\)

b) \(\frac{7}{4}-\frac{1}{2}=\frac{14}{8}-\frac{4}{8}=\frac{10}{8}=\frac{5}{4}\)

c) \(\frac{4}{9}.\frac{6}{8}=\frac{24}{72}=\frac{1}{3}\)

d) \(\frac{14}{5}:\frac{7}{8}=\frac{14}{5}.\frac{8}{7}=\frac{72}{35}\)