Explicație pas cu pas:
m(<a)+m(<b)=31°42'+25°30'=56°72'=57°12'
m(<b)-m(<a)=31°42'-25°30'=6°12'
m(<a)·4=25°30'·4=100°120'=102°
2·m(<a)+4·m(<b)=2·25°30'+4·31°42'=51°+124°168'=51°+126°48'=177°48'
90°-m(<a)=90°-25°30'=89°60'-25°30'=64°30'
5·(m<a:2)=5·(25°30':2)=5·(24°90':2)=5·12°45'=60°225'=63°45'
(4·<b):3=(4·31°42'):3=124°168':3=126°48':3=42°16'
Sper ca te-am ajutat...