Ответ:
5x + 2y = 8,
(11х - у = 23.
11х - у = 23.
У=11х-23
5x + 2y = 8
5x + 2(11х-23) = 8
27х-46=8
27х=54
Х=2
У=11х-23=11*2-23=-1
1)725-225=500
2)134*5=270
3)500:5=100
4)270-100=170
TKE-40°
CAB-110°
MOP-70°
ZXY-60°