先化简,再求比值 28/11 400:25 0.45:0.5 0.7/14怎样简便就怎样算9/7÷11/6+2/9×6/11 5÷5/7-5/7×1/5 5/16+(7/16-1/4)÷1/2

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先化简,再求比值 28/11 400:25 0.45:0.5 0.7/14怎样简便就怎样算9/7÷11/6+2/9×6/11 5÷5/7-5/7×1/5 5/16+(7/16-1/4)÷1/2
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先化简,再求比值 28/11 400:25 0.45:0.5 0.7/14怎样简便就怎样算9/7÷11/6+2/9×6/11 5÷5/7-5/7×1/5 5/16+(7/16-1/4)÷1/2
先化简,再求比值 28/11 400:25 0.45:0.5 0.7/14
怎样简便就怎样算
9/7÷11/6+2/9×6/11 5÷5/7-5/7×1/5
5/16+(7/16-1/4)÷1/2

先化简,再求比值 28/11 400:25 0.45:0.5 0.7/14怎样简便就怎样算9/7÷11/6+2/9×6/11 5÷5/7-5/7×1/5 5/16+(7/16-1/4)÷1/2
28/11=28:11=2又7/11
400:25 =16:1=16
0.45:0.5 =9:10=9/10
0.7/14=1:20=1/20
(注:第一步是化简,第二步是求比值)
9/7÷11/6+2/9×6/11
=7/9×6/11+2/9×6/11
=(7/9+2/9)×6/11
=1×6/11
=6/11
5÷5/7-5/7×1/5
=7-1/7
=6又6/7
5/16+(7/16-1/4)÷1/2
=5/16+7/16×2-1/4×2
=5/16+7/8-1/2
=11/16