当a=0.8,b=0.5,9a+8b-5a-6如何简算
问题描述:
当a=0.8,b=0.5,9a+8b-5a-6如何简算
答
=4a+8b-6
=4*0.8+8*0.5-6
=3.2+4-6
=1.2