五年级下册数学暑假作业答案

五年级下册数学暑假作业答案五年级下册数学暑假作业完整答案2017作业1页码2-31.2/3,4/5,2/3,0.24,100,0.3,0.23,0.6,0.182.(1)3.5multipliedby414(2)1/5,3/5(3)1and3/4,6and2/5(4)3/103.约=10.79,约等于8.394.(1)2.5multipliedby15equals37.5yuan50minus37.5equals12.5yuan(答：略)(2)3dividedby0.8equals3units...0.6yuan答：最多买3支(3)16multipliedby0.75equals12kilometers5multipliedby2.5equals12.5kilometers12.5isgreaterthan12,sohecanwalkfromhometoschool.(4)(46minus20)multipliedby20dividedby2equals260squaremeters(答：略)动脑筋：用倒推法(0.6multipliedby0.6plus0.6)dividedby0.6minus0.6equals1作业2页码4-51.6.9,0.72,0.007,10.3,1.6,0.54,1/72.(1)10.26(2)1/8,5(3)503770(4)1.171plus1/12,3/4minus40(5)450minusmplusn3.BCCC4.(1)25.5dividedby2.5equals10items...0.5kilograms答：需要准备11个这样的瓶子(2)①解：设一双运动鞋需要x元，那么一套运动服需要2.6x元xplus2.6xequals3603.6xequals360xequals1002.6xequals2.6multipliedby100equals260答：略②300dividedby5minus35equals25yuan(3)解：设犁的质量为x千克，那么苹果的质量是2x千克2xplusxequals4503xequals450xequals1502xequals2multipliedby150equals300答：略动脑筋：解：设乙收x吨，那么甲收(xplus12.5)吨，丙收(xplusxplus12.5minus25equals2xminus12.5)吨(xplus12.5)plusxplus(2xminus12.5)equals1304xequals130xequals32.5甲：xplus12.5equals32.5plus12.5equals45丙：2xminus12.5equals2multipliedby32.5minus12.5equals52.5答：略作业3页码6-71.132.36,10.8,0.45,50,60,0.43,3.40,10/192.(1)12个,4个(2)3/4,0.71(3)12(4)长方形,圆(5)4243.简便计算3.8multipliedby2.5multipliedby0.4=3.8multipliedby(2.5multipliedby0.4)=(0.5multipliedby0.2)multipliedby(12.5multipliedby8)=3.8×1=0.1×100=3.8=104、解决问题(1)3.8×180÷3.6=190(个)答：略(2)0.16×75=12(千克)我的体重在地球上重□千克，在月球上重0.16*□=(千克)(3)先求面积：10×4+10×1.6÷2=48(平方米)求重量：0.15×48=7.2(千克)答：略动脑筋：请画示意图。切成64块，就是长宽高都平均分成4份。三个面涂成黑色的小正方体