2x^3-1/3y^2=2*(1/2)^3-1/3*(-3)^2=2*0.5^3-(-3)^2/3=0.25-(-3)^2/3=0.25-9/3=0.25-3=-2.75
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2x^3-1/3y^2=2*(1/2)^3-1/3*(-3)^2=2*0.5^3-(-3)^2/3=0.25-(-3)^2/3=0.25-9/3=0.25-3=-2.75