\(a,\widehat{M}=90^o\\ \Rightarrow\widehat{N}+\widehat{P}=90^o\\ M\text{à}:\widehat{N}:\widehat{P}=3:2\Rightarrow\widehat{N}=1,5\widehat{P}\\ \Rightarrow1,5\widehat{P}+\widehat{P}=90^o\\ \Leftrightarrow\widehat{P}=36^o;\widehat{N}=54^o\)
\(b,\widehat{M}+\widehat{N}+\widehat{P}=180^o\\ M\text{à}:\widehat{M}=80^o\\ \Rightarrow\widehat{N}+\widehat{P}=100^o\\ M\text{à}:\widehat{N}+2\widehat{P}=120^o\\ \Rightarrow\widehat{P}=20^o;\widehat{N}=80^o\\ c,\widehat{M}:\widehat{N}:\widehat{P}=2:1:6\\ M\text{à}:\widehat{M}+\widehat{N}+\widehat{P}=180^o\\ \Leftrightarrow9\widehat{N}=180^o\\ \Leftrightarrow\widehat{N}=20^o\\ \Rightarrow\widehat{M}=2\widehat{N}=2.20^o=40^o\\ \widehat{P}=6.\widehat{N}=6.20^o=120^o\)
