(mx+8)(2-3x)
=2mx-3mx²+16-24x
=-3mx²+(2m-24)x+16
∵不含有x项
∴2m-24=0
∴m=12
(2x+3)(6x+2)-6x(2x+13)+8(7x+2)
=12x²+22x+6-12x²-78x+56x+16
=22
∴结果与x的取值无关
(mx+8)(2-3x)
=2mx-3mx²+16-24x
=-3mx²+(2m-24)x+16
∵不含有x项
∴2m-24=0
∴m=12
(2x+3)(6x+2)-6x(2x+13)+8(7x+2)
=12x²+22x+6-12x²-78x+56x+16
=22
∴结果与x的取值无关