a=4,b=3,代数式a-[b+2a-(a-b)]的值为?
问题描述:
a=4,b=3,代数式a-[b+2a-(a-b)]的值为?
答
a-[b+2a-(a-b)]
=a-(b+2a-a+b)
=a-(2b+a)
=a-2b-a
=-2b
=-2×3
=-6