3×(1/3)^2 -1=
1/4-2×3=
(6/-4 )+3=
(-1/3)^2 -3×(-1/3)+1=
3-cos0/2=
3-cos (п/3)/2=
3-cos (-п)/2=

1)3*(1/3)²-1=3*1/9-1=1/3-1=-2/32)1/4-2*3=1/4-6=-5 3/43)6:(-4)+3=-1,5+3=1,54)(-1/3)²-3*(-1/3)+1=1/9+1+1=2 1/95)3-cos0/2=3-1=2    (если (3-cos0)/2=(3-1)/2=1)6)3-cos(π/3)/2=3-cos(π/6)=3-√3/2  (если (3-cos(π/3))/2=(3-0,5)/2=1,25)7)3-cos(-π)/2=3-0=3 (если (3-сos(-π))/2=(3+1)/2=2)