0.85x199十0.25x8.5x4简便方法
发布网友
共1个回答
热心网友
原式
=0.85x199+(0.25x4)x8.5
=0.85x199+1x8.5
=0.85x199+8.5
=0.85x200-0.85+8.5
=170-0.85+8.5
=169.15+8.5
=177.65
