有两道算术题要简算(1) 20042005*20052004-20042004*20052005(2) (1+0.12+0.23)*(0.12+0.23+0.34)-(1+0.12+0.23+0.34)* (0.12+0.73)
来源：学生作业帮助网 编辑：六六作业网 时间：2024/12/18 20:35:46
有两道算术题要简算(1) 20042005*20052004-20042004*20052005(2) (1+0.12+0.23)*(0.12+0.23+0.34)-(1+0.12+0.23+0.34)* (0.12+0.73)
有两道算术题要简算
(1) 20042005*20052004-20042004*20052005
(2) (1+0.12+0.23)*(0.12+0.23+0.34)-(1+0.12+0.23+0.34)* (0.12+0.73)
有两道算术题要简算(1) 20042005*20052004-20042004*20052005(2) (1+0.12+0.23)*(0.12+0.23+0.34)-(1+0.12+0.23+0.34)* (0.12+0.73)
1、20042005*20052004-20042004*20052005
=（20042004+1）*（20042004+10000）-20042004*(20042004+10001)
=20042004^2+10001*20042004+10000-20042004^2-20042004*10001
=10000
2、(1+0.12+0.23)*(0.12+0.23+0.34)-(1+0.12+0.23+0.34)* (0.12+0.73)
=(1+0.12+0.23)*(0.12+0.23+0.34)-(0.12+0.23+0.34)* (0.12+0.73)-(0.12+0.73)
=(1+0.12+0.23-0.12-0.73)*(0.12+0.23+0.34)-(0.12+0.73)
=0.5*0.69-0.85
=-0.505
1.(20042004+1)*20052004-(20052004+1)*20042004
＝20042004*20052004+20052004-20042004*20052004-20042004
＝10000
10000
2.368