Question

Calcule o valor da expressão 4/5+3/4-1/2

Answer 1

 4/5+3/4-1/2

4*4/4*5  +5*3/5*4 -10*1/10*2

=16/20 +15/20-10/20

=(1/20) * (16+15-10) 

=(1/20) * 21

21/20 é a resposta 

Answer 2

4/5+3/4-1/2
4(4/5)+5(3/4)-10(1/2)
16/20+15/20-10/20
21/20