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Решите задачу : В трех 7мых классах 93 ученика, причем в 7Б классе на 2 ученика меньше, чем в 7А, а в 7В 1/2 общего числа учащиеся в 7А и 7Б классов вместе. Сколько учеников в каждом классе?
Ответы 1
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Всего 93 ученика7 Б - х (учеников)7 А - (х +2) ученика7 В - 1/2(х + х +2) = (2х + 2) = 2(х + 1) = (х + 1) учеников 2 2Составим уравнение: х + х + 2 + х + 1 = 933х = 93 - 2 - 13х = 90 х = 30 ------> 7 Б х + 2 = 32 ------>7 А х + 1 = 31 --------->7 ВОтвет: 32 ученика в 7 А; 30 учеников в 7 Б; 31 ученик в 7 В.
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Автор:
gael351 - 5 лет назад
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Установите соответствие между заголовками A-F и текстами 1-5. Занесите свои ответы в таблицу. Используйте каждую букву только один раз. В задании один заголовок лишний.
A.Disappeared people
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F.Emergency exits are to be done
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4 In spring, heavy rains and melting snow add a lot of water to the lake behind Folsom Dam. People believe too much water could breach the dam. Then the dam might break and flood the towns below the lake. A flood would be very dangerous for the people who live near the dam. They need to find a solution and a way to keep the nearby towns safe. Senator Deborah Ortiz has an idea that might help. She wants to ask the State of California for funds to make the Folsom Dam seven feet taller.
5 Mr. Baldwin believes the way California handles disasters is a good one. People need to know when there is an emergency. They need to be warned. People can be given warnings over the radio. They are also warned over the television. Mr. Baldwin also says that more work needs to be done in an emergency. One thing he is worried about is how to evacuate people from towns. People need to know where to go if they have to leave their homes.-
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Автор:
tiara - 5 лет назад
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