计算下列各题．9.1÷0.13÷2.5
计算下列各题．9.1÷0.13÷2.5（74.8-20.2）÷91+0.40.175÷0.25×47.44÷[（54.7-17.5）×0.5]．...
计算下列各题．9.1÷0.13÷2.5 （74.8-20.2）÷91+0.40.175÷0.25×4 7.44÷[（54.7-17.5）×0.5]．
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①9.1÷0.13÷2.5
=70÷2.5
=（70×4）÷（2.5×4）
=280÷10
=28
②（74.8-20.2）÷91+0.4
=54.6÷91+0.4
=0.6+0.4
=1
③0.175÷0.25×4
=0.7×4
=2.8
④7.44÷[（54.7-17.5）×0.5]
=7.44÷[37.2×0.5]
=7.44÷18.6
=0.4
=70÷2.5
=（70×4）÷（2.5×4）
=280÷10
=28
②（74.8-20.2）÷91+0.4
=54.6÷91+0.4
=0.6+0.4
=1
③0.175÷0.25×4
=0.7×4
=2.8
④7.44÷[（54.7-17.5）×0.5]
=7.44÷[37.2×0.5]
=7.44÷18.6
=0.4
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