№1.5,683 * 57 = 323,9312,483 * 380 = 943,5436,36:18 = 2,0245:17= 45/17 = 2 11/17№2.а) 43,59 - 8,45 : 15 * 8 = 39 1/121) 8,45:15 = 845/1500=169/3002)169/300 * 8 = 338/75 = 4 38/753) 43,59 - 4 38/75 = 43 59/100 - 4 38/75 = 43 177/300 - 4 152/300 = 39 25/300 = 39 5/60 = 39 1/12б) 89,4 + 3,45 : 2 - 11,7 * 4 =44,3251) 3,45:2=1,7252) 11,7*4=46,83) 89,4+1,725=91,1254) 91,125-46,8=44,325№3.а) 12х - 5,14 = 59,6612х=59,66+5,1412х=64,8х=64,8:12х=5,4б) 34 + ( х - 13,6 ) = 74,8х-13,6=74,8-34х-13,6=40,8х=40,8+13,6х=54,4№4.х-яблокиу-груши{4х+6у=178,7 {у=18,94х+6*18,9=178,74х+113,4=178,74х=178,7-113,44х=65,3х=65,3:4х=16,325один ящик с яблоками весит 16,325 кг.