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b)8*X*y-X-y=8*6*(-0.5)-6+0.5=-24-6+0.5=-30+0.5=-29.5
c)(x-1) * (y+1) - x*y=(0.5-1)*(4+1)-0.5*4=2+0.5-4-1-0.5*4=-2.5-2=-4.5
d) x³ - y³ 10³-9³ 1000-729 271
⁻⁻⁻⁻⁻⁻⁻⁻⁻ = ⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻ = ⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻ = ⁻⁻⁻⁻⁻ = 1
x²+x*y+y² 10²+10+9+9² 100+90+81 271