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Подобны ли треугольники ABC и A1,B1,С1 если:
) AB = 1 м, AC = 1,5 м, BC = 2 м; A1B1 = 10см, A1C1 = 15 см, B1C1 =20 см;

2) AB = 1 м, AC = 2 м, BC = 1,5 м; A1B1 = 8дм, A1C1 = 16 дм, B1C1 =12 дм;

3) AB = 1 м, AC = 2 м, BC = 1,25 м; A1B1 = 10 см, A1C1 = 20 см, B1C1 =13 см ?
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