3.5×99+4.62-9.9 简算

问题描述:

3.5×99+4.62-9.9 简算

=3.5*99+4.62-99*0.1
=99*(3.5-0.1)+4.62
=(100-1)*3.4+4.62
=340+(4.62-3.4)
=340+1.22
=341.22