a]
4,8+1.3*[1,2-0,6] =4,8+1,3*0,6=4,8+0,78=5,58
b]
[1-7/9][5,2-0,7] =2/94,5=1
c]
123:10+0,2*6,1 =12,3+1,22=13,52
d]
[6,5-4,7]:[4-2 1/5] =1,8:[4-2,2]=1,8:1,8=1
e]
[ 1,5-1 1/3]*2 2/5 -0,1 =[1 5/10-1 1/3]2,4-0,1=
[1 1/2-1 1/3]2,3= [1 3/6-1 2/6]2/3= 1 1/62/3= 7/62/3=
7/31/3=7/9
f]
[6,25-2 1/2]:2 1/7-1 =[6,25-2,5]:15/7 -1=
3,75:15/7-1= 3 3/4 :15/7-1= 15/4:15/7-1=
15/4*7/15-1=7/4-1=7/4-4/4=3/4=0,75