简算0.8%×17×125%和18÷0.25和60×(5/12-1/5)和(80-9.8)×0.6-2.12

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简算0.8%×17×125%和18÷0.25和60×(5/12-1/5)和(80-9.8)×0.6-2.12
简算0.8%×17×125%和18÷0.25和60×(5/12-1/5)和(80-9.8)×0.6-2.12

简算0.8%×17×125%和18÷0.25和60×(5/12-1/5)和(80-9.8)×0.6-2.12
0.8%×17×125%
=(8/1000)×17×(125/100)
=(17×8×125)/(1000×100)
=(17×1000)/(1000×100)
=0.17
18÷0.25
=18÷1/4
=18×4
=72
60×(5/12-1/5)
=60×5/12-60×1/5
=25-12
=13
(80-9.8)×0.6-2.12
=70.2×0.6-2.12
=70×0.6+0.2×0.6-2.12
=42+0.12-2.12
=40