a) 1/2+1/3×6/2=1/2+2/2=3/2
b) 1/2×3/2+3/4×(-6/5)=3/4+(-9/10) amplificãm pe 3/4 cu 5 si pe -9/10 cu 2=15/20+(-18)/20=-3/20
c) (-5/8)×(4/10)+1/2=(-1/4)+1/2 amplificãm pe 1/2 cu 2=(-1/4)+2/4=1/4
d) 6/4:(-625/1000)-5/10:3/9=6/4×(-1000/625)-5/10×3=(-1500/625)-15/10=(-3)-3/2 amplificãm pe -3 cu 2= -6/2-3/2= -9/2
e) 0,5=5/10=1/2
1/2-1/2×1/12=1/2-1/24 amplificãm pe 1/2 cu 12=12/24-1/24=11/24
f) 1/6+1/6:1/4=1/6+1/6×4=1/6+2/3 amplificãm pe 2/3 cu 2=1/6+4/6=5/6
