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a) \(\frac{21}{11}\cdot\frac{22}{17}\cdot\frac{68}{63}\)
\(=\frac{21\cdot22\cdot68}{11\cdot17\cdot63}\)
\(=\frac{3\cdot7\cdot2\cdot11\cdot4\cdot17}{11\cdot17\cdot7\cdot3\cdot3}\)
\(=\frac{2\cdot4}{3}\)
\(=\frac{8}{3}\)
b) \(\frac{5}{14}\cdot\frac{7}{13}\cdot\frac{26}{25}\)
\(=\frac{5\cdot7\cdot26}{14\cdot13\cdot25}\)
\(=\frac{5\cdot7\cdot2\cdot13}{2\cdot7\cdot13\cdot5\cdot5}\)
\(=\frac{1}{5}\)
=))
\(\frac{42}{17}\times\frac{68}{63}=\frac{8}{3}\)
\(\frac{5}{26}\times\frac{26}{25}=\frac{1}{5}\)
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
21/11 x 22/17x68/63
= 7x3x2x11x4x17 / 11x17x7x3x3
=8/3
5/14x7/13x26/25
=5x7x26 / 14x13x25
= 5x7x13x2 / 7x2x13x5x5
=1/5
a, = 21.22.68 / 11.17.63
=
21.22.68 / 11.22.21.3=68 / 33
b, =5.7.26 / 14.13.25
=
5.7.13.2/7.2.13.5.5= 1/5