:все представляем как 3х+7х+2х=180°
12х=180°
х=15°
15×3 15×7 15×2 = 45,105,30°
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:все представляем как 3х+7х+2х=180°
12х=180°
х=15°
15×3 15×7 15×2 = 45,105,30°