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Автор - NastyaBuruhina23

Помогите плиз решить номер 4 ಥ_ಥ
ಥ_ಥ ಥ_ಥ

Ответ

Автор - maria108369

7x + 8 = 57 \ 7x = 57 - 8  \ 7x = 49 \ x = 7

8x + x = 720 \ 9x = 720 \ x = 80

(90 - y) div 6 = 8 \  frac{90 - y}{6}  = 8 \ 90 - y = 8 times 6 \ 90 - y = 48 \  90 - 48 = y \ y = 42

Ответ

Автор - sokolinskaadara

a 7x + 8 = 57

7x= 57-8

7x = 49

x = 7

b 8x+x=720

9х=720

x= 720÷9

x= 80

с (90-у) ÷6 = 8

90-у=48

-у=48-90

-у= -42

у= 42

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