А) 50+8x+5x=180
50+13х=180
13х=130
х=10
∠х=10*8=80
∠у=10*5=50
Б) 3х+2х+х=180
6х=180
х=30
∠А=3*30=90
∠Б=2*30=60
∠С=30
С) 5х+6х+7х=180
18х=180
∠z=7*10=70
∠x=5*10=50
∠y=6*10=60
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Answers & Comments
А) 50+8x+5x=180
50+13х=180
13х=130
х=10
∠х=10*8=80
∠у=10*5=50
Б) 3х+2х+х=180
6х=180
х=30
∠А=3*30=90
∠Б=2*30=60
∠С=30
С) 5х+6х+7х=180
18х=180
х=10
∠z=7*10=70
∠x=5*10=50
∠y=6*10=60