-
2,75+0,1*10:0,25:5=2,75+1:0,25:5=2,75+\frac{4}{5}=2,75+0,8=3,55
2)
1,4:(2 \frac{2}{3}-1 \frac{1}{2})*6 =\frac{14}{10}:(\frac{8}{3}-\frac{3}{2})*6=\frac{7}{5}:\frac{16-9}{6}*6=
\frac{7}{5}*\frac{6}{7}*6=\frac{36}{5}=7\frac{1}{5}=7,2
3)
2/3 + 1/2 - 0,5 : 0,2 - 0,8 * 1/5 =
\frac{4+3}{6}-2,5-0,8*0,2=