17.15-(3.5-2.85)简便运算

问题描述:

17.15-(3.5-2.85)简便运算

17.15-(3.5-2.85)
=17.15 + 2.85 -3.5
=20-3.5
=16.5

17.15-(3.5-2.85)
=17.15+2.85-3.5
=20-3.5
=16.5