用計(jì)算器計(jì)算前3題,然后仔細(xì)觀察,找出規(guī)律,再把其他算式補(bǔ)充完整,并直接寫(xiě)得數(shù).
88.2÷9=________
88.83÷9=________
88.884÷9=________
________÷________=________
________÷________=________
________÷________=________.
9.8 9.87 9.876 88.8885 9 9.8765 88.88886 9 9.87654 88.888887 9 9.876543
分析:先計(jì)算前三個(gè)算式,得88.2÷9=9.8,88.83÷9=9.87,88.884÷9=9.876,得出規(guī)律:被除數(shù)的整數(shù)部分是88,小數(shù)部分為2、83、884、…,除數(shù)都是9,商的整數(shù)部分都是9,小數(shù)部分為8、87、86、…,依次遞減.據(jù)規(guī)律寫(xiě)出算式即可.
解答:88.2÷9=9.8,
88.83÷9=9.87,
88.884÷9=9.876,
由此得出規(guī)律:被除數(shù)的整數(shù)部分是88,小數(shù)部分為2、83、884、…,除數(shù)都是9,商的整數(shù)部分都是9,小數(shù)部分為8、87、86、…,依次遞減.
88.8885÷9=9.8765,
88.88886÷9=9.87654,
88.8888887÷9=9.876543.
故答案為:9.8;9.87;9.876;88.8885,9,9.8765;88.88886,9,9.87654;88.8888887,9,9.876543.
點(diǎn)評(píng):先計(jì)算給出的算式,根據(jù)算式特點(diǎn),找出規(guī)律,據(jù)規(guī)律解答.