4y+9x²-1/2x²-2y
=17/2x²+2y
=17/2×(-1)²+2×(-1)
=13/2
=72x4y2-1
=72.(-1)4.(-1)2-1
=72.1.1-1
=72-1
=71
4y+9x2-1/2x2-2y
=8,5x2+2y
Thay xo-1; y=-1, ta có
8,5x2+2y=8,5.(-1)2+2.(-1)=6,5
4y+9x²-1/2x²-2y
=17/2x²+2y
=17/2×(-1)²+2×(-1)
=13/2
=72x4y2-1
=72.(-1)4.(-1)2-1
=72.1.1-1
=72-1
=71
4y+9x2-1/2x2-2y
=8,5x2+2y
Thay xo-1; y=-1, ta có
8,5x2+2y=8,5.(-1)2+2.(-1)=6,5