Question

me ayudan a resolver esta operacion?

3/4 + 1/10 - 9/20 =

Answer 1

3/4 + 1/10 = 30+4/40 = 34/40 
34/40 - 9/20 = 680-360/800 = 320/800
al simplificarlo te dara como resultado 2/5 R/

Answer 2

OJO:

3/4 = 3(5)/(4*5) = 15/20

1/10 = 2(1)/(10*2) = 2/20

Entonces:

3/4 + 1/10 - 9/20  = 15/20 + 2/20 - 9/20

3/4 + 1/10 - 9/20  = (15+2-9)/20

3/4 + 1/10 - 9/20  = 8/20 = 2/5 ← Rpta

Eso es todo!! Saludos :)