399.6*9-1998*0.8 巧算
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399.6*9-1998*0.8巧算399.6*9-1998*0.8巧算399.6*9-1998*0.8巧算399.6*9-1998*0.8=399.6*9-399.6*5*0.8=399.6*(9-
399.6*9-1998*0.8 巧算
399.6*9-1998*0.8 巧算
399.6*9-1998*0.8 巧算
399.6*9-1998*0.8
=399.6*9-399.6*5*0.8
=399.6*(9-4)
=399.6*5
=(400-0.4)*5
=400*5-0.4*5
=2000-2
=1998
3996*10*9/10-1998*8/10=1998(2*9-8)/10=1998
=400*9-0.4*9-2000*0.8+2*0.8
=3600-1600-3.6+1.6
=2000-2
=1998
399.6*9-1998*0.8
=399.6*10-399.6-1998+1998*0.2
=3996-1998-399.6+399.6
1998
您好,很高兴为尊敬的您解答难题!
问:399.6*9-1998*0.8=?
399.6*9-1998*0.8
=400*9-0.4*9-2000*0.8+2*0.8
=3600-1600-3.6+1.6
=2000-2
=1998
谢谢!