a, \(\frac{12\times3\times4}{24\times25\times26}\)=\(\frac{12\times3\times2\times2}{12\times2\times25\times13\times2}\)=\(\frac{1\times3\times1\times1}{1\times1\times25\times13\times1}\)=\(\frac{3}{25\times13}\)=\(\frac{3}{325}\)
b, \(\frac{5}{8}\)\(\times\)\(\frac{3}{7}\)\(+\)\(\frac{5}{8}\)\(\times\)\(\frac{4}{7}\)= \(\frac{5}{8}\)\(\times\)\((\)\(\frac{3}{7}\)\(+\)\(\frac{4}{7}\)\()\)
= \(\frac{5}{8}\)\(\times\)\(1\)=\(\frac{5}{8}\)
a) \(\frac{12.3.4}{24.25.26}=\frac{3.2.2.3.4}{2.3.4.25.2.13}=\frac{3}{13.25}\)(Hình như đề có gì sai sai)
b) \(\frac{5}{8}.\frac{3}{7}+\frac{5}{8}.\frac{4}{7}=\frac{5}{8}\left(\frac{3}{7}+\frac{4}{7}\right)=\frac{5}{8}.1=\frac{5}{8}\)
