当x=3.2时,求5x+7x+2.7的值
问题描述:
当x=3.2时,求5x+7x+2.7的值
答
直接把x=3.2代入5x+7x+2.7
5×3.2+7×3.2+2.7
=16+22.4+2.7
=41.1