А) ¼+2,7=0,25+2,7=2,95
б) 4,1 × 2/5 = 4,1×0,4=1,64
в) 2,9- 1¾ = 2,9-1,75=1,15
г) 4,5:2½=4,5:5/2=4,5×2/5=4,5×0,4=1,8
д) 3 2/3 - 0,25= 11/3 - 1/4 = 44/12 - 3/12 = 41/12= 3 5/12
е) 2 1/7 × 0,7 = 8/7 × 7/10 = 8/10 = 0,8
ж) ½:0,3 = 1/2 × 10/3 = 10/6 = 5/3 = 1⅔
з) 2½:4,5=2,5:4,5=25/10 × 10/45 =25/45 = 5/9