Question

Calcule:

$3 \frac{1}{5} + 2 \frac{3}{5} =$
​

Answer 1

Resposta:

3  1/5  +2  3/5

3+1/5+2+3/5

5+4/5

=(5*5+4)/5 =(25+4)/5=29/5

Observe:

multiplicação em X

a/b+c/d=(a*d+b*c)/a*d

3/4+5/6=(3*6+4*5)/4*6 =(18+20)/24=38/24=19/12