là 8 phần 3

21/22*44/17*68/13=21/1*44/1*4*13

=3696/13

\(\frac{21}{22}\)x \(\frac{44}{17}\)x \(\frac{68}{63}\)

= \(\frac{21}{22}\)x \(\frac{176}{63}\)

= \(\frac{8}{3}\)

\(\frac{21}{11}.\frac{22}{17}.\frac{68}{63}\)

\(=\frac{42}{17}.\frac{68}{63}\)

\(=\frac{8}{3}\)

21/11*22/17*68/63=42/17*68/63=8/3

\(\dfrac{21}{11}\times\dfrac{22}{17}\times\dfrac{68}{63}\) = \(\dfrac{42}{17}\times\dfrac{68}{63}\) = \(\dfrac{8}{3}\)

 Vì \(\dfrac{21}{11}\times\dfrac{22}{17}=\dfrac{21\times22}{11\times17}=\dfrac{42}{17}\)

 Vậy:

 \(\dfrac{21}{11}\times\dfrac{22}{17}\times\dfrac{63}{68}\) =\(\dfrac{42}{17}\times\dfrac{68}{63}\) =\(\dfrac{21\times2\times17\times4}{17\times21\times3}\) =\(\dfrac{8}{3}\) = 

21/11 × 22/17 × 68/63

= (21 × 2 × 4)/63

= 8/3

a)8/3

b,1/5 tk cho mk nha pn

b; \(\dfrac{5}{14}\) \(\times\) \(\dfrac{7}{13}\) x \(\dfrac{26}{25}\)

= \(\dfrac{5\times7\times2\times13}{7\times2\times13\times5\times5}\)

= \(\dfrac{5\times7\times2\times13}{5\times7\times2\times13}\) x \(\dfrac{1}{5}\)

= 1 x \(\dfrac{1}{5}\)

= \(\dfrac{1}{5}\)

a; \(\dfrac{21}{11}\) x \(\dfrac{22}{17}\) x \(\dfrac{68}{63}\)

= \(\dfrac{21\times11\times2\times17\times4}{11\times17\times21\times3}\)

= \(\dfrac{11\times17\times21}{11\times17\times21}\) x \(\dfrac{2\times4}{3}\)

= 1 x \(\dfrac{8}{3}\)

= \(\dfrac{8}{3}\)

\(\dfrac{21}{11}\times\dfrac{22}{17}\times\dfrac{68}{63}:\dfrac{4}{3}=\dfrac{21}{11}\times\dfrac{22}{17}\times\dfrac{68}{63}\times\dfrac{3}{4}=\dfrac{462}{187}\times\dfrac{204}{252}=\dfrac{42}{17}\times\dfrac{17}{21}=\dfrac{2}{1}=2\)

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

\(=\dfrac{21}{11}\times\dfrac{22}{17}\times\dfrac{68}{63}\times\dfrac{3}{4}=\dfrac{42}{17}\times\dfrac{17}{21}=\dfrac{42}{21}=\dfrac{2}{1}=2\)

\(\frac{8}{3}\)NHỚ K NHÉ

mk nghĩ kết quả = \(\frac{8}{3}\)

nếu đúng thì tk mk nha

3161/11781

k mik nha chúc bn học giỏi

a,8/3

b,1/5

ai giúp mình với !