Предмет: Математика, автор: arabesque2019team

3) На пошив 3 одинаковых платьев уходит 7 метров ткани. Сколько метров ткани необходимо, чтобы пошить 9 таких платьев?
4) 300 яблок поделили поровну между пятью детьми. Во сколько раз меньше яблок досталось бы каждому ребенку, если бы было 15 детей?

Ответы

Автор ответа: Hlud

3 задача

Составляем пропорцию:

7 (м) : 3 (шт) = Х (м) : 9 (шт)

Свойство пропорции : произведение крайних членов равно произведению средних членов пропорции.

3*Х = 7*9 = 63 — находим неизвестное — Х — делением.

Х = 63 : 3 = 21 м — на 9 шт — ОТВЕТ

ИЛИ

9 (шт) : 3 (шт) = 3 раза больше.

7 (м) * 3 = 21 м — на 9 шт — ОТВЕТ

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We use money every day to pay for things we buy. We pay with either coins or paper money. This sort of money is known as cash. There is also another kind of money. It includes cheeks, credit cards, and travellers checks.
The idea of having such a thing as money is one of the most fascinating ever developed by man. But many people don't know where this idea came from, or why money is valuable.
Thousands of years ago, money was not used. Instead, man had the "barter" system. This meant that if a man wanted something he didn't have, he had to find someone who had it. Then he had to offer him something in exchange. And if that man didn't like what he was offered in exchange, the first man couldn't get what he needed.
In time, certain things came to be used as money because practically everyone would take these things in exchange. In the past, people used shells, beads, cocoa beans, salt, grain, tobacco, skins, and even cattle. Butcoins are much easiser to use than, say, cattle. They are sasy to store and to carry about.
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