Предмет: Математика, автор: narzullaievar

пришла ко мне сестра, попросила помочь. А я сама как полено. Хелп..умоляю

Приложения:

val52803: Б (-3х+51):10 = (-3*(-3) +51):10 =(9+51):10 =60:10 =6

Ответы

Автор ответа: kingpinguin

Ответ:

Б

Пошаговое объяснение:

когда отрицательное число умножаем или делим на отрицательное число, то получаем положительное число. выражение в скобках надо решить первым и после этого делить.

Приложения:

Автор ответа: сок111213

Ответ: Б)

$( - 5x + 54) \div 9 = \\ ( - 5 \times ( - 3) + 54) \div 9 = \\ (15 + 54 )\div 9 = 69 \div 9 = 7 \frac{2}{3}$

$( - 3x + 51) \div 10 = \\ ( - 3 \times ( - 3) + 51) \div 10 = \\ (9 + 51) \div 10 = 60 \div 10 = 6$

$(3x + 51) \div 6 = \\ (3 \times ( - 3) + 51) \div 6 = \\ ( - 9 + 51) \div 6 = 42 \div 6 = 7$

$(5x + 54) \div 9 = \\ (5 \times ( - 3) + 54) \div 9 = \\ ( - 15 + 54) \div 9 = \\ 39 \div 9 = 4 \frac{1}{3}$

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