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Nutka1998 [239]
3 years ago
9

На первых трёх уроках Вася получил по одной оценке: 3, 4 и 5. Дома он сказал: " Пятерку я получил не на третьем уроке. А четверк

у получил на втором ". Потом оказалось, что оба раза Вася сказал неправду. На каком уроке Вася получил тройку?
Mathematics
1 answer:
Verizon [17]3 years ago
6 0

"Пятерку я получил не на третьем уроке" - ложь. Значит, пятерку Вася получил на третьем уроке.

"Четверку получил на втором" - тоже ложь. Значит, четверку Вася мог получить на перовом или на третьем уроке.

Выше мы выяснили, что на третьем уроке он получил пятерку, следовательно, четверку Вася получил на первом уроке.

Свободны остались только второй урок и тройка.

Ответ: Вася получил тройку на втором уроке.

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