Предмет: Математика, автор: ЭВИ11

Номера 3,4 СРОЧНО ЗАВТРА В ШКОЛУ!!!!!!!!!!!!

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Автор ответа: 19G

0

v против течения: v собственная-v течения. v течения равно 1, v против течения равно 14, значит v собственная равна 15.
v по течению равно v собственная +v течения, значит 15+1=16

Автор ответа: 19G

0

это №3

Автор ответа: 19G

0

№4

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If you do not use your arms or your legs for some time, they become weak; when you start using them again, they slowly become strong again. Everybody kmows this, and nobody would think of questioning this fact. Yet there are many people who do not seem to know that the memory works in the same way. When someone says that he has a good memory, he really means that he keeps his memory in practice by exercising it regularly, either consciously or unconsciously. When someone else says that his memory is poor, he really means that he does not give it enough opportunity to become strong. The position is exactly the same as that of two people, one of whom exercises his arms and legs by playing tennis, while the other sits in a chair or a motor car all day.

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