(1)A² *B
=(-2x)²(1/2x²+3x-1)
=4x²(1/2x²+3x-1)
=2x的4次方+12x³-4x²
(2)3A* B -A*( B -A)
=3AB-AB+A²
=2AB+A²
=2×(-2x)×(1/2x²+3x-1)+(-2x)²
=-2x³-12x²+4x+4x²
=-2x³-8x²+4x