а)-148+(-273)= -421
б)-36+(-54) -90
в)-48+67= 19
г)-22,6+(-5,4) = -28
д)84+(-69) = 15
е) 4.75+(-2,83) = 1,92
ж)-3 7/9+(-2 5/9) = - 5 12/9 = -6 3/9 = - 6 1/3
з)-1 8/15+1 9/20 = - 1 32/60 + 1 27/60 = -5/60 = -1/12
и)-0.37+(-0,84) = - 1,21
к) 5/18+(-7/24) = 20/72 - 21/72 = -1/72
л)-3 4/13+(-1 4/63) = - 3 252 /819 - 1 52/819 = - 4 304/819
м)-6,5+8,23.= 1,73