Пусть2,7<х<9и 1,5<у<3.Оцените 1)2ху 2)2ху+1 3)х/у+4
2,74.05 1)2(4.05)<2xy<2(27) = <strong>8.1<2xy<54</strong> 2) 1+8.1<2xy + 1 < 54 +1 = <strong>9.1<2xy+ 1<55</strong> 2.7/1.51.8 3)4+1.85.8