当a=2.5,b=1.8,c=1.4时,ab-ac的值是_.
问题描述:
当a=2.5,b=1.8,c=1.4时,ab-ac的值是______.
答
ab-ac,
=a(b-c),
=2.5×(1.8-1.4),
=1.
故答案为:1.