简算0.1996*0.19971997-0.1997*0.1997急用

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简算0.1996*0.19971997-0.1997*0.1997急用
简算0.1996*0.19971997-0.1997*0.1997
急用

简算0.1996*0.19971997-0.1997*0.1997急用
(0.1997-1)*0.19971997-0.1997*0.1997
=0.1997*0.19971997-0.19971997-0.1997*0.1997
=(0.19971997-0.1997)*0.1997-0.19971997
=(0.00001997)*0.1997-0.19971997