Ex 25 urgent vă rog frumos

Răspuns:
a)
x+x+100°=180°
2x=80°
x=40°
b)
x+102°+2x=180°
3x=78°
x=26
c)
2x+3x+x+72°=180°
6x=108°
x=18°
d)
60°+2x+40°+2x+x=180°
100°+5x=180°
5x=80°
x=16°
Răspuns:
a)x+x+100=180°
2x=80° x=40°
b)102+x+2x=180°
3x=78° x=26°
c)2x+3x+x+72=180
6x=108°. x=18°
d)2x+2x+x+40+60=180
5x=80. x=16°