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damilyaibraeva
@damilyaibraeva
July 2022
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найти значение выражения 3а-4b-с, если а-b=5, b+c=3?
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artalex74
Если a-b=5, то a=b+5.
Если b+c=3, то c=3-b.
Тогда 3a-4b-c = 3(b+5)-4b-(3-b)=3b+15-4b-3+b=12.
Ответ: 12.
2 votes
Thanks 8
damilyaibraeva
Спасибо большое!!!!
artalex74
та на здоровье! примитив же... )))
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Answers & Comments
Если b+c=3, то c=3-b.
Тогда 3a-4b-c = 3(b+5)-4b-(3-b)=3b+15-4b-3+b=12.
Ответ: 12.