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b)3,2:(0,8-2/5)=17/10:(4/5-2/5)= 17/10*2/5=17/25
c)2/3*(1/2-1/6)= 2/3*(3/6-1/6)=2/3*2/6=2/9
d)4,8+1/3*(1/2-0,6)=4 4/5+1/3*(0,5-0,6)=4 4/5+1/3*(-1/10)=4 4/5+(-1/30)=4 24/30+(-1/30)=-23/30
e)(1-7/9)*(5,2-0,7)=2/9*21/5=14/15
f)123:10+0,2*6,1=12,3+1,22=13,52
g)(6,5-4,7):4-2 1/5)=1,8:1,8=1
h)(1,5-1 1/3)*2 1/5-0,1=(1 1/5-1 1/3)*2 2/5-1/10=(1 3/15- 1 5/15)*2 2/5-1/10=0,3
I)(6,25-2 1/2):2 1/7-1=(6,25-2,5):2 1/7-1=97/20*7/14-1=1 3/3-1=3/4