999乘998998999减998乘999999998的简便计算等于1997

来源:学生作业帮助网 编辑:六六作业网 时间:2024/11/15 11:39:47
999乘998998999减998乘999999998的简便计算等于1997999乘998998999减998乘999999998的简便计算等于1997999乘998998999减998乘999999

999乘998998999减998乘999999998的简便计算等于1997
999乘998998999减998乘999999998的简便计算
等于1997

999乘998998999减998乘999999998的简便计算等于1997
=(100-1)*998998999-(100-2)*999999998=100*998998999-1*998998999-(100*999999998-2*999999998)=99899899900-998998999-99999999800+1999999996=900901097