1.25×9-12.5-0.12的简便方法
问题描述:
1.25×9-12.5-0.12的简便方法
答
1.25×9-12.5-0.12
=1.25×(10-1)-12.5-0.12
=12.5-1.25-12.5-0.12
=-1.25-0.12
=-1.37