当x=-1,a=296,b-307,c=2009时,x(a+b-3c)-(3c-a-b)的值是()
问题描述:
当x=-1,a=296,b-307,c=2009时,x(a+b-3c)-(3c-a-b)的值是()
答
x(a+b-3c)-(3c-a-b)
=-(a+b-3c)-(3c-a-b)
=-a-b+3c-3c+a+b
=0你确定等于0?是的哦 = =