Ta có :
\(\frac{5}{9}\times\frac{2}{7}=\frac{10}{63};\frac{2}{3}+\frac{5}{6}=\frac{3}{2}\) \(5-\frac{13}{17}=\frac{72}{17};\frac{9}{11}:\frac{5}{13}=\frac{117}{55}\)
\(5+\frac{9}{14}=\frac{79}{14};\frac{6}{54}:8=\frac{1}{72}\) \(\frac{24}{72}-\frac{202}{909}=\frac{1}{9};\frac{9}{11}:\frac{5}{13}=\frac{117}{55}\)
Học tốt nha !
#Sơn#
5/9\(\times\)2/7=10/63
2/3+5/6=4/6+5/6=9/6=3/2
5+9/14=70/14+9/14=79/14
6/54:8=1/9:8=1/9\(\times\)1/8=1/72
5-13/17=85/17-13/17=72/17
3:9/10=3\(\times\)10/9=30/9=10/3
24/72-202/909=1/9
9/11:5/13=9/11\(\times\)13/5=117/55
\(\frac{5}{9}\)\(\times\frac{2}{7}\)\(=\frac{5\times2}{9\times7}\)\(=\frac{10}{63}\)
\(\frac{2}{3}\)\(+\frac{5}{6}\)\(=\frac{12+15}{18}\)\(=\frac{27}{18}\)\(=\frac{3}{2}\)
\(5+\frac{9}{14}\)\(=\frac{70+9}{14}\)\(=\frac{79}{14}\)
\(\frac{6}{54}\)\(\div8\)\(=\frac{6}{54}\)\(\times\frac{1}{8}\)\(=\frac{6\times1}{54\times8}\)\(=\frac{6}{432}\)\(=\frac{1}{72}\)
\(5-\frac{13}{17}\)\(=\frac{85-13}{17}\)\(=\frac{72}{17}\)
\(3\div\frac{9}{10}\)\(=3\times\frac{10}{9}\)\(=\frac{3\times10}{9}\)\(=\frac{30}{9}\)\(=\frac{10}{3}\)
\(\frac{24}{72}\)\(-\frac{202}{909}\)\(=\frac{21816-14544}{65448}\)\(=\frac{7272}{65448}\)\(=\frac{1}{9}\)
\(\frac{9}{11}\)\(\div\frac{5}{13}\)\(=\frac{9}{11}\)\(\times\frac{13}{5}\)\(=\frac{9\times13}{11\times5}\)\(=\frac{117}{55}\)
Hok tốt !
