Предмет: Математика, автор: диана422

как решить эти премеры?

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Автор ответа: Ukiko09

Нужно выучить правило. + на - дает -, - на - дает плюс. Правило раскрывать скобки и приводить к общему знаменателю. 1) 43-60+12+39-21=94-81=13 2) -1,23+2,14+7,38-5,77+1,62=11,14-7=4,14 3) -3/7+14/19-4/7+3 5/19=(складываем и вычитаем с одинаковым знаменателем)= 4-1=3 Последние по аналогии с предыдущим. Главное понять принцип

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