Ответ:\(1,3+6,4=7,7\)\(13-8,7=4,3\)\(4,9+2,12=7,02\)\(9,2-5,71=3,49\)\(6,89+0,761=7,651\)\(0,902-0,09=0,812\)Ответ: 1) 7,7; 2) 4,3; 3) 7,02; 4) 3,49; 5) 7,651; 6) 0,812.