4.99+4.99+4.99+0.04+4.99

4.99+4.99+4.99+0.04+4.99 怎么简便计算

2个回答

4.99+4.99+4.99+0.04+4.99
=4.99+4.99+4.99+0.01+0.01+0.01+0.01+4.99
=(4.99+0.01)+(4.99+0.01)+(4.99+0.01)+(4.99+0.01)
=5+5+5+5
=20