10.1×0.99
=(10+0.1)×0.99
=10×0.99+0.1×0.99
=9.9+0.099
=9.999
或
10.1×0.99
=10.1 ×(1-0.01)
=10.1 ×1-10.1 ×0.01
=10.1-0.101
=9.999 10.1×0.99
=(10+0.1)×0.99
=10×0.99+0.1×0.99
=9.9+0.099
=9.999
或
10.1×0.99
=10.1 ×(1-0.01)
=10.1 ×1-10.1 ×0.01
=10.1-0.101
=9.999