计算:(1)a(2a²+1) (2)(-4x²+6x)(-1/2x²)
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计算:(1)a(2a²+1) (2)(-4x²+6x)(-1/2x²)
计算:(1)a(2a²+1) (2)(-4x²+6x)(-1/2x²)
计算:(1)a(2a²+1) (2)(-4x²+6x)(-1/2x²)
(1)a(2a²+1)
=a×2a²+a×1
=2a³+a
(2)(-4x²+6x)(-1/2x²)
=-4x²×(-1/2x²)+6x×(-1/2x²)
=2x的4次方-3x³