Объяснение:
(7x+28°)+(3x+17°)=145°
10x=145°-45°
10x=100
x=10°
∡A=3x+17°=3*10°+17°=30°+17°=47°
∡A=47°
∡B=7x+28°=7*10°+28°=70°+28°=98°
∡B=98°
Объяснение:
(7x+28°)+(3x+17°)=145°
10x=145°-45°
10x=100
x=10°
∡A=3x+17°=3*10°+17°=30°+17°=47°
∡A=47°
∡B=7x+28°=7*10°+28°=70°+28°=98°
∡B=98°