Question

2/9+3/8
5/12+4/15
7/34+5/51

Answer 1

все мы должна привести к общему знаменателю:
2/9+3/8=16/72+27/72= 43/72
5/12+4/15=25/60+16/60=41/60
7/34+5/51=21/102+10/102=31/102

Answer 2

$\frac{2}{9}+\frac{3}{8}=\frac{16}{72}+\frac{27}{72}=\frac{43}{72}$
$\frac{5}{12}+\frac{4}{15}=\frac{25}{60}+\frac{16}{60}=\frac{41}{60}$
$\frac{7}{34}+\frac{5}{51}=\frac{21}{102}+\frac{10}{102}=\frac{31}{102}$