Question

9 - 7 =
--- ---
10 20

Answer 1

Resposta:

Explicação passo a passo:

= 9/10 - 7/20

Mmc (10,20)= 20

10,20: 2

5, 10: 2

5, 5: 5

1,1

= 2.2.5

= 20

= (2.9 - 1.7)/20

= (18-7)/20

= 11/20

Answer 2

11/20

Explicação:

9/10-7/20 =

(20÷10×9)-(20÷20×7)/20 =

(2×9)-(1×7)/20 =

18-7/20 =

11/20