简算 小学五年级

来源：百度知道 编辑：UC知道 时间：2024/06/08 03:23:20
(20052005-2005.2005)/(80208020-8020.8020)

8.1*1.3-8/1+1.9*1.3+11.9/1.3

(20052005-2005.2005)÷(80208020-8020.8020)
=2005*(10001-1.0001)÷[8020*(10001-1.0001)
=2005÷8020
=1/4

8.1×1.3-8÷1.3+1.9×1.3+11.9÷1.3
=(8.1+1.9)×1.3+(11.9-8)÷1.3
=13-3
=10

(20052005-2005.2005)/(80208020-8020.8020)
=2005*(10001-1.0001)/8020*(10001-1.0001)
=2005/8020
=1/4

(20052005-2005.2005)/(80208020-8020.8020)
=[2005*(10001-1.0001)]/[8020*(10001-1.0001) ]
=2005/8020
=1/4

上楼啊！你好粗心，连方括号都忘了加，这样算出来的答案是不对的！

(20052005-2005.2005)/(80208020-8020.8020)
=[2005*(10001-1.0001)]/[8020*(10001-1.0001) ]
=2005/8020
=1/4
应该是这样做吧.

(20052005-2005.2005)/(80208020-8020.8020)
=20050000/80200000=0.25

(20052005-2005.2005)/(80208020-8020.8020)
=[2005*(10001-1.0001)]/[8020*(10001-1.0001) ]
=2005/8020
=1/4