74.6-(16.2-8.7怎样计算简便
问题描述:
74.6-(16.2-8.7怎样计算简便
答
(75-0.4)-(16+0.2)+(9-0.3)
=(75-16+9)-(0.4+0.2+0.3)
=68-0.9
=67.1