1) 5\12+4\15 2)3\4+5\18 3)2\26+3\39 4)7\34+5\51 5)4\210+5\140 6)7\450+8\180 7)9\180+7\120...

1) $\frac{5}{12} + \frac{4}{15} = \frac{41}{60}$
2) $\frac{3}{4} + \frac{5}{18} =1 \frac{1}{36}$
3) $\frac{2}{26} + \frac{3}{39} = \frac{2}{13}$
4) $\frac{7}{34} + \frac{5}{51} = \frac{31}{102}$
5) $\frac{4}{210} + \frac{5}{140} = \frac{23}{420}$
6) $\frac{7}{450} + \frac{8}{180} = \frac{3}{50}$
7) $\frac{9}{180} + \frac{7}{120} = \frac{13}{120}$