43+(-60)+12+39+(-21)= 43 - 60 + 12 + 39 - 21 = 13
-1,23+2,14+7,38+(-5,77)+1,62= 4,14
-3/7+14/19+(-4/7+3целых 5/19) = - 57/133 + 98/133 + (-76/133 + 434/133) =
= 41/133 + 358/133 = 399/133 = 3
-5/18+(-4/81)+7/18+13/81= - 45/162 - 8/162 + 63/162 + 26/162 = 36/162 = 2/9
-3целых 5/11+1целых 3/8+2целых 5/16+(-4целых 6/11) = = - 38/11 + 11/8 + 37/16 - 50/11 = - 608/176 + 242/176 + 407/176 - 800/176 = = - 1409/176 + 649/176 = - 759/176 = - 4 55/176 = - 4 5/16