雅思买什么书:20022003乘20032002减20022002乘20032003
来源:百度文库 编辑:查人人中国名人网 时间:2024/04/29 03:29:05
怎样求这题的简便运算
20022003x20032002-20022002x20032003
=(20022002+1)x20032002-20022002x(20032002+1)
=20022002x20032002+20032002-20022002x20032002-20022002
=20032002-20022002
=10000
=(20022002+1)x20032002-20022002x(20032002+1)
=20022002x20032002+20032002-20022002x20032002-20022002
=20032002-20022002
=10000