Question

Cuanto es?
1. 1/5 × 5/8 × 8/5 × 10/8=
2. 14/5 × 27/7 × 8/5 × 2/8=
3. 8/4 × 5/25 × 81/9 × 144/12=
​

Answer 1

1. 2/5 (Decimal: 0,4):

1/5 × 5/8 × 8/5 × 2/8

= 1/8 × 8/5 × 10/5

1/5 × 10/5

1/5 × 2

1/5 × 2/1

1 × 2

5 × 2

_ 2__

5 × 1

= 2/5

2. 108/25 (Decimal: 4,32):

14/5 × 27/7 × 8/5 × 2/8

= 14/5 × 27/7 × 2/5

7×2 × 27/7 × 2/5

5

2/5 × 27/1 × 2/5

2 × 27 × 2

5 × 1 × 5

__108___

5 × 1× 5

=108

25

3. 216/5 (Decimal: 43,2):

8/4 × 5/25 × 81/9 × 144/12

= 2 × 5/25 × 81/9 × 144/12

2 × 5/25 × 9 × 144/12

2 × 5/25 × 9 × 12

2 × 1/5 × 9 × 12

2/1 × 1/5 × 9 × 12

2/1 × 1/5 × 9/1 ×12

2/1 × 1/5 × 9/1 × 12/1

2 × 1 × 9 × 12

1 × 5 × 1 × 1

____216____

1×5 × 1 × 1

= 216

5