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B) 2,8+1 1/3•0,9= 2,8+4/3*9/10=2,8+36/30=2,8+1 1/5= 2,8+1,2=4
C) 3,6:3/5-1 1/5= 3,6:0,6-6/5=6 - 6/5=6-1,2=4,8
D) 0,2^2*(1,62/5)=0,2²( (1,60,4)=0,2²*1,2=0,2*0,2*1,2=0,04*1,2=0,048
E) 2,8•1 1/4-2/3•0,75= 2,8*1,25-2/3*3/4=3,5-1/2=3,5-0,5=3
F) (4,5-1,1)•2•3/4-1= 3,4*2*3/4-1=6,8*3/4-1=68/10*3/4-1=204/40-1=5 1/10-1=
4 1/10=4,1