人教版五年級上2.5用計(jì)算器探索規(guī)律練習(xí)題及答案

第6課時用計(jì)算器探索規(guī)律不夯實(shí)基礎(chǔ);難建成高樓。1.填表。單價(元)數(shù)量總價(元)牙膏3支28.5毛巾8.254塊牙刷5把9.952.在括號里填上適當(dāng)?shù)臄?shù)。()×7＝11.55()×25＝810124×()＝460.0436×()＝4035.63.用計(jì)算器;計(jì)算前四題;直接寫出后三題的得數(shù)。(1)3×4＝3.3×3.4＝3.33×33.4＝3.333×333.4＝3.3333×3333.4＝3.33333×33333.4＝3.333333×333333.4＝(2)81÷9＝88.2÷9＝88.83÷9＝88.884÷9＝88.8885÷9＝88.88886÷9＝88.888887÷9＝4.先找出規(guī)律;再填數(shù)。(1)1;1.1;1.3;1.6;();();3.1(2)0.81;0.64;0.49;0.36;();()(3)3;1.5;0.75;0.375;()(4)40;10;2.5;0.625;()重點(diǎn)難點(diǎn);一網(wǎng)打盡。5.試一試;你會用計(jì)算器計(jì)算多步計(jì)算題嗎？eq\x(5.5)eq\o(→,\s\up7(÷11))eq\x()eq\o(→,\s\up7(×6.2))eq\x()eq\o(→,\s\up7(×0.5))eq\x()eq\o(→,\s\up7(×0.1))eq\x()eq\x(12.4)eq\o(→,\s\up7(×0.25))eq\x()eq\o(→,\s\up7(÷0.31))eq\x()eq\o(→,\s\up7(÷0.5))eq\x()eq\o(→,\s\up7(×0.4))eq\x()6.根據(jù)333667×3＝1001001填空;再用計(jì)算器檢驗(yàn)。333667×6＝________333667×9＝________333667×12＝________333667×18＝________333667×24＝________333667×27＝________舉一反三;應(yīng)用創(chuàng)新;方能一顯身手！7.用計(jì)算器探索規(guī)律。(1)先用計(jì)算器算出前四個算式;再根據(jù)規(guī)律直接寫出其他算式的得數(shù)。1×8＋1＝12×8＋2＝123×8＋3＝1234×8＋4＝12345×8＋5＝123456×8＋6＝1234567×8＋7＝(2)用計(jì)算器算出下面算式的得數(shù)。532532＋7＝496496＋7＝532532＋11＝496496＋11＝532532＋13＝496496＋13＝532532＋77＝496496＋77＝532532＋91＝496496＋91＝532532＋143＝496496＋143＝532532＋1001＝496496＋1001＝8.用計(jì)算器計(jì)算下面各題;并照樣子再編三道題;直接寫出結(jié)果。(10－1)÷0.9＝________(200－2)÷0.9＝________(3000－3)÷0.9＝________(4000－4)÷0.9＝______________＝______________＝_____________＝________第6課時1.9.5331.992.1.6532.43.71112.13.(1)1211.22111.2221111.222211111.22222111111.2222221111111.2222222(2)99.89.879.8769.87659.876549.8765434.(1)22.5(2)0.250.16(3)0.1875(4)0.156255.0.53.11.550.1553.1102086.2002002300300340040046006006800800890090097.(1)9989879876987659876549876543(2)