可以先算12.5-12.5=0,然后再算6.3+6.3=12.6
12.5+6.3-12.5+6.3
=(12.5-12.5)+6.3+6.3
=0+6.3+6.3
=12.6
简便计算过程方法如下
解:12.5+6.3-12.5+6.3
=(12.5-12.5)+6.3+6.3
=0+6.3+6.3
=12.6
用加法交换律计算
12.5+6.3-12.5+6.3
=12.5-12.5+6.3+6.3
=0+6.3+6.3=12.6
解:12.5+6.3-12.5+6.3
=12.5-12.5+(6.3+6.3)
=0+12.8=12.8
12.5+6.3-12.5+6.3
=12.5-12.5+6.3+6.3
=6.3+6.3
=6.3×2
=12.6
望采纳