a) Transformam prima fractie apoi o simplificam si aducem la acelasi numitor: 0,8+2/3=8/10+2/3=4/5+2/3=(4*3+2*5)/(5*3)=22/15=1 intreg si 7/15
b) Tranformam a doua fractie in fractie zecimala, impartind numaratorul la numitor 3,05-7/40=3,05-0,175=2.875
c)0,48*1/8=0,48:8=0,06
d) 1/3-0,(3)*0,25=
=1/3-3/9*25/100=
=1/3-1/3*1/4=
=1/3-1/12=
=(4*1-1)/12=
=3/12=
=1/4
e) 0,1:(4+1/25)=
=(1/10):[(4*25+1)/25]=
=(1/10):(101/25)=
=(1/10)*(25/101)=
=25/1010=
=5/202
f)
