首页 > 留学知识库

问题: 2.3*5.6+7简便方法计算清

解答:

2.3*5.6+7
=2.3*6-2.3*0.4+7
=13.8-0.92+7
=20.8-0.92
=20.8-1+0.08
=19.8+0.08
=19.88