6.12*99+6.12简便方法怎么算?还有5.9*101-5.9都用简便方法
问题描述:
6.12*99+6.12简便方法怎么算?还有5.9*101-5.9都用简便方法
答
6.12×99+6.12
=6.12×(99+1)
=6.12×100
=612
5.9×101-5.9
=5.9×(101-1)
=5.9×100
=590