3.82X9.9+0.382?要简便计算!

问题描述:

3.82X9.9+0.382?要简便计算!

=3.82×(9.9+0.1)=382

原式=3.82x9.9+3.82x0.1
=3.82x(9.9+0.1)
=3.82x10
=38.2