1) .....=8/5*1/2+1,8*1/2=4/5+9/10=8/10+9/10=17/10=1,7
2) .....=1 7/15 : 2 2/10=22/15 * 10/22=10/15=2/3
3) .....=(1 3/4+1/6)*2,4=(1 9/12+2/12)*2,4=33/12 * 12/5=33/5=6 3/5=6,6
4) .....=(5 2/5 - 2 1/3) : 7 2/3=3 1/15 : 7 2/3=46/15 * 3/23=2/5=0,4
5) ....=7/3 * 12/100+1/4 * 12/100=28/100+3/100=0,31
6) .....=76/10 * 10/19 - 19/4 * 10/19=4 - 10/4=4-2 1/2=4-2,5=1,5