Ответ:\(54-27=27\); \(52\cdot27=1404\); \(61+1404=1465\).\(63:3=21\); \(19\cdot5=95\); \(21+95=116\).\(509-458=51\); \(51\cdot6=306\).\(513+351=864\); \(864:16=54\).Ответ: 1) 1465; 2) 116; 3) 306; 4) 54.