2(x-8)-7(8-x),
=2x-16-56+7x
=9x-72
=9x1-72
=9-72
=-63
(x-2²)-6(2-x)
=x-4-12+6x
=7x-16
=7x-2-16
=-14-16
=-30
如果本题有什么不明白可以追问,