432.1乘以123.4-432.2乘以123.3(怎样简便计算）_数学解答

432.1乘以123.4-432.2乘以123.3(怎样简便计算）

人气：186 ℃　时间：2020-04-21 07:20:53

解答

432.1×123.4－432.2×123.3
=432.1×123.4－（432.1+0.1）×123.3
=432.1×123.4－432.1×123.3－0.1×123.3
=432.1×（123.4－123.3）－12.33
=432.1×0.1－12.33
=43.21－12.33
=30.88