Question

简便算法34.5+27.8-32.3-34.5-27.8+32.3？

简便算法，34.5+27.8-32.3-34.5-27.8+32.3怎么写

Answer 1

34.5+27.8-32.3-34.5-27.8+32.3
=34.5-34.5+27.8-27.8+32.3-32.3
=(34.5-34.5)+(27.8-27.8)+(32.3-32.3)
=0

Answer 2

34.5+27.8-32.3-34.5-27.8+32.3

=34.5+27.8-32.3-34.5-27.8+32.3

=0

一对一对的消去了。