Question

Me ajudem pfv!!!!!!!

Answer 1

1 2/3 + 4/7
5/3+4/7
5x7/21+4x3/21
35/21+12/21
47/21

2 5/4+3 1/2
13/4+7/2
13/4+7x2/4
13/4+14/4
27/4

3 4/5+3 7/8
19/5+31/8
19x8/40+5x31/40
152/40+155/40
307/40

espero ter ajudado =]