Предмет: Алгебра, автор: maksimkomarov200781

ПОЖАЛУЙСТА ПОБЫСТРЕЕ ДАЮ 20 БАЛЛОВ
Найдите значение дроби: 72/(〖13〗^2-〖11〗^2 );
Применяем формулу: а^2-в^2=(а-в)(а+в)

Ответы

Автор ответа: DimaPuchkov
1

Ответ:

\frac{72}{(13^2-11^2)} =\frac{72}{(13-11)\cdot(13+11)}=\frac{72}{2\cdot24}=\frac{3}{2\cdot 1}=\frac{3}{2}

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USA AGRICULTURE(1)
Nearly 400 years ago European colonists came to America. The colonists began to settle. They cleared the land and transformed forests into croplands and pastures. The settlers lived in a group of houses around a central field. Here grazed the village cattle.
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Most of the farms in the USA are family farms. Only 3 percent of them are led by corporations that are owned by families. People who have small pieces of land cannot invest in the modern equipment. Often they sell their land to other farmers. There are tenant farmers who rent this land for cash or give the owner a part of the crops they grow. Owners of large farms hire seasonal workers. Many of these seasonal workers travel from farm to farm. They stay only for the period of picking crops. They are known as migrant workers. The USA is divided into six main regions.
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The Great Lakes region is also an important area for farming. Corn, wheat and dairy products are the most important agricultural items. Farmers often rotate soybeans — that is, planting corn in a field one year and soybeans the next. The region has enough rainfall, which is very important for hay, grown to feed dairy cattle. Wisconsin is the most important dairy state in the region.
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