6.8乘9.9 10.1乘0.63 （简便计算）_数学解答

6.8乘9.9 10.1乘0.63 （简便计算）

人气：389 ℃　时间：2020-03-29 02:37:49

解答

=6.8×(10-0.1)
=6.8×10-6.8×0.1
=68-0.68
=67.32=(10+0.1)×0.63
=10×0.63+0.1×0.63
=6.3+0.063
=6.363