Odpowiedź :
a) 80+5a = 180
5a = 180-80
5a = 100 /5
a = 20
4a = 80
a+3a-8 = 12
4a = 12+8
4a = 20 /4
a = 5
3a-8 = 15-8 = 7
a)
α+4α+80°=180° |-80°
5α=100°|:5
α=20°
b)
a+(3a-8)=12
a+3a-8=12 |+8
4a=20 |:4
a=5
a) 80+5a = 180
5a = 180-80
5a = 100 /5
a = 20
4a = 80
a+3a-8 = 12
4a = 12+8
4a = 20 /4
a = 5
3a-8 = 15-8 = 7
α+4α+80°=180° |-80°
5α=100°|:5
α=20°
a+(3a-8)=12
a+3a-8=12 |+8
4a=20 |:4
a=5