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1、10÷3.14-6.86÷3.1437.68÷0.25÷43.75-(2.75-1.3)37.56-(18+7.56)0.77÷144.5×9.80.7÷0.1250.7÷0.252.5×3.2×12.512.5×9.6×0.253.75-(2.8-1.25)37.65÷0.4÷0.253.125÷8÷0.12537.65-4.75-3.2525×6.4×12.53.6×0.25答案10÷3.14-6.86÷3.14=(10-6.86)÷3.14=3.14÷3.14=137.68÷0.25÷4=37.68÷(0.25×4)=37.68÷1=37.683.75-(2.75-1.3)=3.7
2、5-2.75+1.3=1+1.3=2.337.56-(18+7.56)=37.56-7.56-18=30-18=120.77÷14=0.77÷7÷2=0.11÷2=0.0554.5×9.8=4.5×(10-0.2)=4.5×10-4.5×0.2=45-0.9=44.10.7÷0.125=(0.7×8)÷(0.125×8)=0.56÷1=0.560.7÷0.25=(0.7×4)÷(0.25×4)=2.8÷1=2.82.5×3.2×12.5=(2.5×0.4)×(8×12.5)=1×100=10012.5×9.6×0.25=(12.5×0.8)×3×(4×0.25)=10×3×1=303.7
3、5-(2.8-1.25)=3.75+1.25-2.8=5-2.8=2.237.65÷0.4÷0.253.125÷8÷0.12537.65-4.75-3.2525×6.4×12.5=25×4×0.2×8×12.53.6×0.25=(4-0.4)×0.253.4÷9+5.6÷9=一、时态: 一般现在时,现在进行时,一般过去时,现在完成时,一般将来时,过去进行时,过去完成时,过去将来时 1.一般现在时 表示一般性,经常性的动作或一般性事实。 1含有be动词的句子 Heisateacher. Thegirlisverybeautiful. TimandJackarestudents
4、. ★变疑问句将be动词移到句首 Isheateacher? Isthegirlverybeautiful? AreTimandJackstudents? ★变否定句在be动词后面加not Heisnotateacher. Thegirlisnotverybeautiful. TimandJackarenotstudents. ★肯定回答及否定回答 Yes,heis.No,heisnot. Yes,sheis.No,sheisnot. Yes,theyare.No,theyarenot. ★不含有be动词的句子,即含有一般动词的句子 第三人称单数及单数名词
5、Helikesbooks. Shelikeshim. Thedoglikesbones. ★变疑问句在句首加does,动词变为原型 Doeshelikebooks? Doesshelikehim? Doesthedoglikebones? ★变否定句在主语及动词之间加doesn’t,动词变为原型,原句中的动词不再有第三人称变化。 Hedoesn’tlikebooks. Shedoesn’tlikehim. Thedogdoesn’tlikebones. ★肯定回答及否定回答: Yes,hedoes.No,hedoesn’t. Yes,shedoes.No,she
6、doesn’t Yes,itdoes.No,itdoesn’t. 注意:第三人称单数形式一般在动词后面加S,不要和名词复数混淆,变否定句或疑问句时名词复数没有任何变化。 其他人称及复数名词 Iwanttohaveabath. Wehavesomemeat. Thestudentslikesmartteachers. ★变疑问句在句首加do Doyouwanttohaveabath? Dowehaveanymeat? Dothestudentslikesmartteachers? ★变否定句在主语和动词之间加don’t. Youdon’twanttohaveabat
7、h. Wedon’thaveanymeat. Thestudentsdon’tlikesmartteachers. ★肯定回答及否定回答 Yes,Ido.No,Idon’t. Yes,wedo.No,wedon’t Yes,theydo.No,theydon’t.6.过去完成时: