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2014-05-17T13:28:12+03:00
1000 < x < 1500
9=3²
16=2⁴
20= 2² *5
[9,16,20]=3² * 2⁴ * 5= 9*16*5=720
1000< x < 1500⇒ 
⇒x=2*[9,16,720]+4
x=2*720+4
x=1440+4
x=1444

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