Question

o valor da expressão : 1/ 2 + 3 /4 - 4 /5 é:
​

Answer 1

1/ 2 + 3 /4 - 4 /5

Múltiplos 2: 2,4,6,8,10,12,14,16,18,20...

Múltiplos 4: 4,8,12,16,20...

Múltiplos 5: 5,10,15,20

2 × 2 × 5 = 20

1 × 10/2 × 10 + 3 × 5/4 × 5 - 4 × 4/5 × 4

10/20 + 15/20 - 16/20

10 + 15 - 16/20

9/20

Answer 2

1/ 2 + 3 /4 - 4 /5

1 × 2/2 × 2 + 3/4 - 4/5

2/4 + 3/4 - 4/5 → 5/4 - 4/5

5 × 5/4 × 5 - 4 × 4/5 × 4 → 25/20 - 16/20

= 9/20