(3x+9)(6x+8)
问题描述:
(3x+9)(6x+8)
答
(3x+9)(6x+8)
=3x(6x+8)+9(6x+8)
=18x^2+24x+54x+72
=18x^2+78x+72
答
(3x+9)(6x+8)
=3x(6x+8)+9(6x+8)
=(18x^2+24x)+(54x+72)
=18x^2+78x+72