-0,8(3)+1 3/4-0,3(8)+0,375=?
mai intii calculam pe fiecare:
-0,8(3)=-(83-8)/90=-(75/90)=-((15*5)/(15*6))=-5/6
1intreg3/4=1+3/4=7/4
0,3(8)=(38-3)/90=35/90=((5*7)/(5*18))=7/18
0,375=375/1000=((125*3)/(125*8))=3/8
Rezolvare:
-5/6+7/4-7/18+3/8=
numitor comun 72
-60/72+126/72-28/72+27/72=(-60+126-28+27)/72=
=((126+27)-(60+28))/72=(153-88)/72=65/72 sau 0,902(7)
