a) \(\frac{21}{11}\times\frac{22}{17}\times\frac{68}{63}=\frac{7\times3\times11\times2\times17\times4}{11\times17\times3\times3\times7}=\frac{8}{3}\)
b) \(\frac{5}{14}\times\frac{7}{13}\times\frac{26}{25}=\frac{5\times7\times13\times2}{2\times7\times13\times5\times5}=\frac{1}{5}\)
\(\frac{21}{11}\cdot\frac{22}{17}\cdot\frac{68}{63}=\frac{7\cdot3\cdot2\cdot11\cdot17\cdot4}{11\cdot17\cdot7\cdot3\cdot3}=\frac{8}{3}\)
\(\frac{5}{14}\cdot\frac{7}{13}\cdot\frac{26}{25}=\frac{5\cdot7\cdot13\cdot2}{7\cdot2\cdot13\cdot5\cdot5}=\frac{1}{5}\)
số nào giống thì gạch đi nhé
a)\(\frac{21}{11}.\frac{22}{17}.\frac{68}{63}=\frac{21.22.68}{11.17.63}=\frac{7.3.11.2.17.4}{11.17.3.3.7}=\frac{8}{3}\)
b)\(\frac{5}{14}.\frac{7}{13}.\frac{26}{25}=\frac{5.7.26}{14.13.17}=\frac{5.7.13.2}{7.2.13.17}=\frac{1}{5}\)
a) \(\frac{21}{11}\times\frac{22}{17}\times\frac{68}{63}=\frac{42}{17}\times\frac{68}{63}=\frac{8}{3}\)
b) \(\frac{5}{14}\times\frac{7}{13}\times\frac{26}{25}=\frac{5}{26}\times\frac{26}{25}=\frac{5}{25}=\frac{1}{5}\)
Đáp số : a) \(\frac{8}{3}\) ; b)\(\frac{1}{5}\)
