a) (2 × 3 × 8)/(4 × 5 × 6 × 7)

= (6 × 2 × 4)/(4 × 5 × 6 × 7)

= 2/(5 × 7)

= 2/35

b) (36 × 22 × 51)/(11 × 17 × 72)

= (36 × 2 × 11 × 3 × 17)/(11 × 17 × 2 × 36)

= 3

Lời giải:
a.

\(\frac{2\times 3\times 8}{4\times 5\times 6\times 7}=\frac{2\times 24}{24\times 5\times 7}=\frac{2}{5\times 7}=\frac{2}{35}\)

b.

\(\frac{36\times 22\times 51}{11\times 17\times 72}=\frac{36\times 2\times 11\times 17\times 3}{11\times 17\times 72}=\frac{72\times 11\times 17\times 3}{11\times 17\times 72}=3\)

b.

`[2xx3xx8]/[4xx5xx6xx7]=[2xx3xx4xx2]/[4xx5xx2xx3xx7]=2/[5xx7]=2/35`

`(2 xx 3 xx 8)/(4 xx 5 xx 6 xx 7)`

`= (2 xx 3 xx 4 xx 2)/(4 xx 5 xx 3 xx 2 xx 7)`

`= (cancel{2} xx cancel{3} xx cancel{4} xx 2)/(cancel{4 xx 5 xx cancel{3} xx cancel{2} xx 7)`

`= 2/(5 xx 7)`

`= 2/35`

\(\dfrac{2}{35}\)

`a)[3xx2xx8]/[4xx5xx6xx7]`

`=[3xx2xx4xx2]/[4xx5xx3xx2xx7]`

`=2/[5xx7]=2/35`

`b)[36xx22xx51]/[11xx17xx72]`

`=[9xx4xx11xx2xx17xx3]/[11xx17xx9xx4xx2]`

`=3`

\(\dfrac{3\times2\times2\times2\times2}{2\times2\times5\times2\times3\times7}=\dfrac{2}{35}\)

a) \(\dfrac{3.2.8}{4.5.6.7}=\dfrac{1.1.4}{2.5.2.7}=\dfrac{2}{35}\)

b) \(\dfrac{36.22.51}{11.17.72}=\dfrac{1.2.3}{1.1.2}=\dfrac{6}{2}=3\)

2/35 k minh nha

\(\frac{2x3x8}{4x5x6x7}=\frac{2x3x2x4}{2x2x5x2x3x7}=\frac{4}{70}\)

\(\frac{4}{70}=\frac{2}{35}\)

k mik nha

  2 x 3 x 8

=6 x 8

= 48

4 x 5 x 6 x 7

= 20 x 6 x 7

= 120 x 7

= 840

Tích mik nhé bank

 2x3x8

= 6 x 8

= 48

4x5x6x7 

= 20x42

=840

2 x 3 x 8 = 6 x 8 = 48

4 x 5 x 6 x 7 = 20 x 6 x 7 = 120 x 7 = 840