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vladimirm2005
@vladimirm2005
August 2022
2
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реши уравнения 7x(3+k)=33+5k
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avsirena
7 * (3 + k) = 33 + 5k
21 + 7k = 33 + 5k
7k - 5k = 33 - 21
2k = 12
k = 12 : 2
k = 6
-----------------------
Проверка: 7 * (3 + 6) = 33 + 5 * 6
7 * 9 = 33 + 30
63 = 63
9 votes
Thanks 9
prettypushkova
Verified answer
21+7к=33+57к-5к=33-212к=12К=6
29 votes
Thanks 49
vladimirm2005
а как вы получили21?
vladimirm2005
спс
prettypushkova
Раскрыла скобки и получила 7 * 3 + 7 * k = 21 + 7k
prettypushkova
Распределительное свойство умножения
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Answers & Comments
21 + 7k = 33 + 5k
7k - 5k = 33 - 21
2k = 12
k = 12 : 2
k = 6
-----------------------
Проверка: 7 * (3 + 6) = 33 + 5 * 6
7 * 9 = 33 + 30
63 = 63
Verified answer
21+7к=33+57к-5к=33-212к=12К=6