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raushanturlihan
raushanturlihan
27.02.2022 12:37 •  Алгебра

Постройте график функции =2+4+5 и найдите промежутки знакопостоянства.

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Ответ:
iulia085
iulia085
10.11.2021 03:59

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Must Waste More Time...

0,0(0 оценок)
Ответ:
kg9191
kg9191
21.05.2020 21:45
Ну это совсем просто, главное выучить его раз и навсегда.
(+) - положительное число, (-) - отрицательное число. Итак:
(+) + (+) = (+) например, 5+7=12
(-) + (-)=(-) например, (-5)+(-7)=-12 (т.е. при сложении отрицательных чисел мы складываем их как положительные и перед результатом ставим минус)
теперь непосредственно к вопросу:
 при сложении чисел с разными знаками отнимаем от большего числа меньшее и ставим знак большего числа (имеется в виду большего по модулю):
 (-5) + 7= 2; 7 больше 5, значит у 2 знак 7, т.е.+
5+(-7)=-2, т.к. по модулю -7 больше 5.
в умножении и делении еще проще:
(-) * (+)=(-) здесь ничего от модуля не зависит
(-) / (+)=(-)
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