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-3 ×
9 — x² + 5x — 12 — 3x³ + 2x
-3-4x²+7x
x=3
-3-4*9+7*9=-3-36+63=-24
2
1,3xy+4x²+6,5y²
x=-4 y=¼
1,3*(-4)*¼+4*(-4)²+6,5*¼²=
=-1,3+64+6,5*1/16=
=62,7*13/32=815,1/32