吴傅
幼苗
共回答了22个问题采纳率:95.5% 举报
(1)19.8*37-199.8*1.9+1998*0.82
=198*0.1*37-199.8*1.9+199.8*10*0.82
=198*3.7-199.8*1.9+1998*8.2
=198*(3.7-1.9+8.2)
=198*10
=1980
(2)13分之8*[4分之3-(16分之3-4分之1)]
=8/13*[3/4-(3/16-1/4)]
=8/13*(3/4-3/16+1/4)
=8/13*(1-3/16)
=8/13*13/16
=1/2
1年前
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