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

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

 Vậy:

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

8/3 nha bạn

21/11 × 22/17 × 68/63

= (21 × 2 × 4)/63

= 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

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

21/11 x 22/17 x 68/63 = 952/357

5/14 x 7/13 x 6/25=3/65

\(\frac{21}{11}X\frac{22}{17}X\frac{68}{63}=\frac{952}{357} \)

\(\frac{5}{14}X\frac{7}{13}X\frac{6}{25}=\frac{3}{65}\)

ko iểu

cái này là 2 phép tính riêng biệt hay là gì hả bạn ?

2 phép tính khác nhau!

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

= \(\frac{42}{17}\)x\(\frac{68}{63}\)

= \(\frac{8}{3}\)

18 - x : 2 = 16

x : 2        = 18 - 16

x             = 2 x 2

x             = 4

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

\(=\frac{21}{11}\times\frac{22\times68}{17\times63}\)

\(=\frac{21}{11}\times\frac{22\times4}{1\times63}\)

\(=\frac{21}{11}\times\frac{88}{63}\)

\(=\frac{21\times88}{11\times63}\)

\(=\frac{1\times8}{1\times3}\)

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

\(18-x:2=16\)

\(x:2=18-16\)

\(x:2=2\)

\(x=2\times2\)

\(x=4\)

Tính theo cách thuận tiện : 

21/11 × 22/17 × 68/63

= ( 21/11 × 68/63 ) × 22/17

= 68/33 × 22 / 17

= 8/3

Tìm x , biết : 

18-x:2=16

x:2=18-16

x:2=2

x=2×2

= 4

Vậy x = 4