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nytamurmur
@nytamurmur
July 2022
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помогите!!!!!!!!!!!!!!!!!!
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Verified answer
1)9/4<(x/4)<15/4⇔ 9<x<15
2) 2 целых 2/9 < 20/x <6 целых 2/3 ⇔
20/9 < 20/x < 20/3⇔1/9<1/x<1/3 ⇔
+ - +
1/9<1/x (x-9)/x<0 --------0///////////////////////////////////////9----------
{ ⇔{ + - +
1/x<1/3 (x-3)/x>0 ///////////0-----------------3//////////////////////////////////
x∈(3;9)
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Answers & Comments
Verified answer
1)9/4<(x/4)<15/4⇔ 9<x<152) 2 целых 2/9 < 20/x <6 целых 2/3 ⇔
20/9 < 20/x < 20/3⇔1/9<1/x<1/3 ⇔
+ - +
1/9<1/x (x-9)/x<0 --------0///////////////////////////////////////9----------
{ ⇔{ + - +
1/x<1/3 (x-3)/x>0 ///////////0-----------------3//////////////////////////////////
x∈(3;9)