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9x=180°
x=180° : 9
x=20°
czyli kąty 5x=5•20°=100°
2x=40°
2x=40°
b) 3x+x+2x+60=180
6x+60=180
6x=180-60
6x=120
x=20°
kąty 3x=3•20=60°
x=20°
2x+60=2•20+60=100°