当A=-1时,求16+2a-{8a-[a-9-(3-6a)]}=
问题描述:
当A=-1时,求16+2a-{8a-[a-9-(3-6a)]}=
答
16-2-{-8-[-1-9-(3+6)]}=3还要先化简,在求值16+2a-{8a-[a-9-(3-6a)]}
=16+2a-[8a-(a-9-3+6a)]
=16+2a-(8a-7a+12)
=16+2a-a-12
=a+4
=3