有两道算术题要简算(1) 20042005*20052004-20042004*20052005(2) (1+0.12+
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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
(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
=(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
有两道算术题要简算(1) 20042005*20052004-20042004*20052005(2) (1+0.12+
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