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Данякеп
@Данякеп
August 2021
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Всё наа фотоо..........
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oganesbagoyan
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3.
Пусть дробь a/b уменьшится на p процентов :
a/b - (a/b)*p/100 =(a+a*20/100)
/
(b+50/100) ;
(a/b)*(1-p/100) =120a/150b ;
* * * 120a/150b= (120a/150b)*(a/b) =(4/5) *(a/b) * * *
(a/b)*(1-p/100) =(4/5)*(a/b) ; || :(a/b)
1-p/100 =4/5 ;
* * * p/100 = 1-4/5 ; p/100 =1/5 ; p =20 * * *
p =20.
ответ: уменьшится на p =20 % .
----------------------
4.
= (3*9/4+1/4) : (2 +5) =(27/4+1/4) : 7 = (28/4) :7 =7:7
=1 .
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Answers & Comments
Verified answer
3.Пусть дробь a/b уменьшится на p процентов :
a/b - (a/b)*p/100 =(a+a*20/100) / (b+50/100) ;
(a/b)*(1-p/100) =120a/150b ;
* * * 120a/150b= (120a/150b)*(a/b) =(4/5) *(a/b) * * *
(a/b)*(1-p/100) =(4/5)*(a/b) ; || :(a/b)
1-p/100 =4/5 ;
* * * p/100 = 1-4/5 ; p/100 =1/5 ; p =20 * * *
p =20.
ответ: уменьшится на p =20 % .
----------------------
4.
= (3*9/4+1/4) : (2 +5) =(27/4+1/4) : 7 = (28/4) :7 =7:7 =1 .