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b) 2,8 + 1 1/3 * 0,9=2,8+4/3*0,9=2,8+1,2=4
c) 3,6:3/5-1 1/5=3,6:0,6-1 1/5=6-6/5=6-1,2=4,8
d) 0,2do potęgi2*(1,6-2/5)=0,04*(1,6-0,4)=0,04*1,2=0,048
e) 2,8*1 1/4-2/3*0,75=2,8*1,25-2/3*0,75=3,5-2/3*0,75=3,5-0,5=3
f) (4,5-1,1)*2*3/4-1= 3,4*2*3/4-1=6,8*0,75-1=5,1-1=4,1