Ответ:
1=7х
8=5х
7х+5х=180
12х=180
х=180:12
х=15
1=15×7=105°
8=15×5=75°
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Ответ:
1=7х
8=5х
7х+5х=180
12х=180
х=180:12
х=15
1=15×7=105°
8=15×5=75°