Объяснение:
x+y+135=180
x+y=45
x=45-y
x+z+45=180
x+z=135
z-y=90
z=90+y
2x+y+z=180
2x=y
2(45-y)=y
90-2y=y
90=3y
y=30
x=45-30=15
z=90+30=120
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Объяснение:
x+y+135=180
x+y=45
x=45-y
x+z+45=180
x+z=135
z-y=90
z=90+y
2x+y+z=180
2x=y
2(45-y)=y
90-2y=y
90=3y
y=30
x=45-30=15
z=90+30=120