(3/8-25%)*8/5/6*5/2
=〔(3/8-2/8)*8〕/〔5/6*5/2〕
=〔3-2〕*〔6/5*5/2〕
=1*6/2
=1*3
=3
0.9+99×9/10
=9/10*1+99*9/10
=9/10*(1+99)
=9/10*100
=9*10
=90
(14/15*1/2)÷(2-4/9)
=7/15/14/9
=7/15*9/14
=3/10
=0.3
怎么了?
(3/8-25%)*8/5/6*5/2
=〔(3/8-2/8)*8〕/〔5/6*5/2〕
=〔3-2〕*〔6/5*5/2〕
=1*6/2
=1*3
=3
0.9+99×9/10
=9/10*1+99*9/10
=9/10*(1+99)
=9/10*100
=9*10
=90
(14/15*1/2)÷(2-4/9)
=7/15/14/9
=7/15*9/14
=3/10
=0.3
怎么了?