Пошаговое объяснение:
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jdjdudiidd
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sgevfoxugenfoye
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Если х - угол В, тогда х+0.2х - угол А, х-0.8х - угол С, 180 - сумма трех углов.
Составим уравнение:
х + х + 0.2х + х - 0.8х = 180
2.4х = 180
х = 75 - угол В
75 + 0.2 х 75 = 75 +15 = 90 - угол А
75 - 0.8 х 75 = 75 - 60 = 15 - угол С