21/11 × 22/17 ×68/63
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![](https://rs.olm.vn/images/avt/0.png?1311)
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\(\dfrac{21}{11}\times\dfrac{22}{17}\times\dfrac{68}{63}\) = \(\dfrac{42}{17}\times\dfrac{68}{63}\) = \(\dfrac{8}{3}\)
Vì \(\dfrac{21}{11}\times\dfrac{22}{17}=\dfrac{21\times22}{11\times17}=\dfrac{42}{17}\)
Vậy:
\(\dfrac{21}{11}\times\dfrac{22}{17}\times\dfrac{63}{68}\) =\(\dfrac{42}{17}\times\dfrac{68}{63}\) =\(\dfrac{21\times2\times17\times4}{17\times21\times3}\) =\(\dfrac{8}{3}\) =
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{21}{11}\times\dfrac{22}{17}\times\dfrac{68}{63}:\dfrac{4}{3}=\dfrac{21}{11}\times\dfrac{22}{17}\times\dfrac{68}{63}\times\dfrac{3}{4}=\dfrac{462}{187}\times\dfrac{204}{252}=\dfrac{42}{17}\times\dfrac{17}{21}=\dfrac{2}{1}=2\)
21/11 x 22/17 x 68/63 : 4/3
=( 21/11 x 22/17) x (68/63 : 4/3)
= 42/17 x 17/21
= 2/1 = 2
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{21}{11}.\frac{22}{17}.\frac{68}{63}\)
\(=\frac{42}{17}.\frac{68}{63}\)
\(=\frac{8}{3}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
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
![](https://rs.olm.vn/images/avt/0.png?1311)
21/11 × 22/17 ×68/63=21.22.68/11.17.63=8/3
21/11 x 22/17 x 68/63
= 21 x 22 x 68/11 x 17 x 63
= 1 x 2 x 68/1 x 17 x 3
= 136/51