\(\frac{\left(\frac{4}{7}+\frac{4}{9}-\frac{4}{11}\right)}{\left(\frac{5}{7}+\frac{5}{9}-\frac{5}{11}\right)}=\frac{\left(\frac{64}{63}-\frac{4}{11}\right)}{\left(\frac{80}{63}-\frac{5}{11}\right)}=\frac{\frac{452}{693}}{\frac{565}{693}}=\frac{452}{565}=\frac{4}{5}\)
c) (4/7+4/9-4/11) / (5/7+5/9-5/11)
=(452/693 ) / (565/693)
= 452/565
=4/5
\(\left(\frac{4}{7}+\frac{4}{9}-\frac{4}{11}\right):\left(\frac{5}{7}+\frac{5}{9}-\frac{5}{11}\right)\)
\(=\left(\frac{64}{63}-\frac{4}{11}\right):\left(\frac{80}{63}-\frac{5}{11}\right)\)
\(=\frac{7}{11}:\frac{565}{693}\)
\(=\frac{441}{565}\)
nha bạn. chúc mừng năm học mới nha
