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1、混合运算练习题姓名:一、细心填一填。1.直接写得数。480+60=1300-400=46+17=81-18=100-46=65+27=93-14=56+34=300+3000=1200-800=47+39=82-35=7505-0=45+36=70-28=27+43=2.计算268+(721-495),先算()法,后算()法。3.二年级有196人,一年级比二年级少42人,一、二年级共有()人。二、想一想下面算式的计算顺序,然后计算。(在先算的下面划)245+476+158=346-(548-471)=547-359+258=306+25
2、8-247=715-(482+159)=251+(449-356)=三、用竖式计算。285+(923-456)=394-(785-597)=912-678+326=300-217+503=720-325-279=679+(567-123)=四、在○里填上“>”“<”或“=”。382+237+138○547+242297○476-289578+385○984-158724-396+175○548-59956○748+226353-156○198五、解决问题。1.学校举行为困难地区小朋友捐款的活动。二年级一共捐款435元,三年级比二年级多捐
3、了78元。两个年级一共捐款多少元?2.百货商店有428台洗衣机,第一个月卖了146台,之后又运来205台,现在有多少台?3.图书室第一周借出280本书,第二周借出342本,还剩259本。图书室原来有多少本书?4.中心小学二年级植树106棵,三年级比二年级多植树25棵,四年级植树150棵,四年级比三年级多植树多少棵?choosewaterfountains,water-savingproductsshouldbepurchased.Ascomparedtoopenv-Groovetypewatersupplysystem,sealedni
4、pplewatersystemcansavewater81.35%savingbeddingconsumption56.3%;sanitationanddrinkingwater,andavarietyofharmfulgasesconcentrationsdecline,increasedlayingrate13.79%,economicefficiencyimproved.ChickenCoopconstructionshouldpayattentiontoseveralproblems,chickendistributionnot
5、es:arationalstructureofthehen-houselayout,canprovideagoodenvironmentforchicken,makingitsfullproductivepotential,sootherthaninunderstandingthephysiologicalcharacteristicsofthechickenitself,andmustbeproperlyplannedandconstructedsheds.1.sitestochooseawayfrompopulatedareas,t
6、rafficconvenient,awayfromtheroad2.Gaozaoterrain,alotofsunshine.Wintersunaspossible,summerwind,andnotaftertherainwater.Larger,leavingroomfordevelopment3.Abundantwaterresourcespollution-free,easytoaccess,sufficientpowerisguaranteed4.Buildingstructure,theeconomy,savingmoney
7、,andsavingenergy,itisfacinginaccordancewithlocalenvironmentalandphysiologicalcondition,lightingisgood,easytoventilation,easytooperate,soconducivetocoolinginthesummer,toinsulationinwintercold5.Layoutofpremisesshouldbereasonable,dodistinguishbetweenproductionandnon-product
8、ionareasandnon-productionareasandwatersourcesareonachickenfarminthewind,netroadanddirtroadseparatingunc