Question

qual o resultado da fração 2/7 +3/5+1/4?

Answer 1

$\frac{2}{7} + \frac{3}{5} + \frac{1}{4} \to mmc=140 \\\\ \frac{40+84+35}{140} \to \\\\ \frac{159}{140}$

Answer 2

2  + 3   +  1
7     5       4

20.2 + 28.3 + 35.1  = 40 + 84 + 35 = 159
    140                             140             140


7,5,4: 2
7,5,2: 2
7,5,1: 5
7,1,1: 7
1,1,1   =  2.2.5.7 = 4.35 = 140