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1、宜賓市第八中學(xué)校校本作業(yè)（數(shù)學(xué)）第2章有理數(shù)§2.10有理數(shù)的乘法（3）【課前導(dǎo)習】1.計算（－＋）×6的結(jié)果是（）、1、-2、2、02.下列計算中正確的是（）、（-12）×（－－1）=-4＋3＋1=0、（-18）×〔－（-）〕=9、（-12）×（－－1）=-4－3－12=-10、-5×2×｜-2｜=-203．為了使算式（-0.125）×3×（-8）＋(-12)×(＋－)×2計算最簡便，可以運用的運算律是（）、乘法交換律和結(jié)合律、乘法結(jié)合律和分配律、乘法交換律和分配律、乘法交換律、結(jié)合律和分配律4.計算30×（－＋0.4）的結(jié)果為。5.×（-5）＋×（-13）=×〔（-5）＋
2、（-13）〕，根據(jù)的運算律是。6.19×16=（20－）×16=20×16－16×=?！井斕糜?xùn)練】計算：1.(＋－)×(-12);2.-3.75－〔0.75＋(-)〕×（-4）;3.99×(-36)；4.（-）×8－（-）×（-4）＋（-8）×enforcedthermalinsulationstartscheckingsystem,issuedbythethermalinsulationconstructionbeforeyoustarttonotice,transferinspectionofupperandloweroperationandtransferofrecor
3、ds.Foroutdooroperation,pipelineequipmenttoeffectivelycarryouttheinsulationwaterproofmeasuresfailtoinstallprotectivepanelsinpartwiththreetarpaulincover,topreventinsulationfrommoisture.InsulationseamMichaelJackson5mm,joints,joints>100mm,insulationthicknesstolerance(+10MM~–5mm),appropriatemate
4、rialelasticbanding,spacingaccordingtothedesignrequirements,rigidinsulationsoftmaterialsforconstructionjointstight;Andlarge-diameterverticalpipeforhightemperaturepipelineinstrictaccordancewithdesigndrawingscalledfortheestablishmentofexpansionjointsandholdingbracket;Designrequirementsintoarem
5、ovabletypeofinsulation,instrictaccordancewithspecificationsdisconnectfromtheotherinsulation;Surfaceinsulationboardsinthetechnologyofplasteringconstructionofwovenclothtopreventpollutionandprotectivepanelsflushwiththesurfaceinterface,tightandclean.Sitemeasurementofinsulationboardsforelbowshap
6、ecutting,ensurethateachpieceoflappedtraffic,arctransitionofnatural,beautiful,screwsup.Stampedeoutsideconstructionpersonnelisstrictlyprohibitedandshelveobjectsdirectlyontheoutershield.Inordertopreventthepollution-proneheater,channelareaofsecondarypollutionoflarge-diameterpipesandotherequipme
7、nt,weavingcloth,anderectionoftheseparationplatformforpreservation.Thermalinsulationconstruction,on-hooktackweldedtotheconsolidatedline,toensureevenlyspaced,andthehooknaileddown...Seenextpageflowchartmanagementprocess.7.2Generalrequirementsforprotectivepr
