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[48/40-35/40]*12/17=13/40*12/17=39/170
b]=
25/16-4/3=75/48-64/48=11/48
2a]=
3,2-1,27=1,93
b]=
(-1,35):(-0,3)=4,5
3a]
35-25% z 35=35-0,25*35=26,25
b] 60%x=43,2
x=43,2:0,6
x=72
c]
75=100%
39=x%
...............
x=39*100:75
x=52%
4a]=
[(2^5)²:2³] / [2³*2^4]=2^7:2 ^7=1
b]=
3 ^ -12*3^15 ; 3^5=3 do potegi -2=1/9
5]
a-b=2-√3-3-2√3=-1-3√3
a*b=[2-√3] [ 3+2√3]=6+4√3-3√3-6=√3
a/b=[(2-√3)(3-2√3)] / [(3+2√3)(3-2√3)]=[6-4√3-3√3+6]/[9-12]=[12-7√3] / -3=[7√3-12]/3
1/a=1/[2-√3]=[2+√3] /[ 4-3]=2+√3
b²=[3+2√3]²=9+12√3+12=21+12√3
a) 3,2-1/2*2,54=3,2-0,5*2,54=3,2-1,27=1,93
b) (-2,8+1,45):(-0,3)=(-1,35):(-0,3)=4.5