4.05/0.81-2.81用简便运算
问题描述:
4.05/0.81-2.81用简便运算
答
4.05/0.81-2.81
=4.05÷(0.9×0.9)-2.81
=4.05÷0.9÷0.9-2.81
=4.5÷0.9-2.81
=5-2.81
=2.19