小学数学人教版四年级下册教学10单元总复习1课时数与代数1

www.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.com2.根据加、减、乘、除法各部分间的关系，分别写出另外两个算式。54＋38＝9275－29＝4628×30＝840864÷24＝3692－54＝3892－38＝5475－46＝2929＋46＝75840÷28＝30840÷30＝28864÷36＝2424×36＝864我们先来回忆一下加、减、乘、除法各部分间的关系，再来填空吧！对应练习二 www.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.com我用树状图的方式整理了第三单元运算定律的知识点。除法除法的运算性质：a÷b÷c＝a÷（b×c）乘法交换律：a×b＝b×a乘法结合律：（a×b）×c＝a×（b×c）乘法分配律：（a＋b）×c＝a×c＋b×c乘法乘法运算定律加法加法运算定律加法交换律：a＋b＝b＋a加法结合律：（a＋b）＋c＝a＋（b＋c）减法减法的运算性质：a－b－c＝a－（b＋c）第三单元运算定律课堂小结三 www.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.com1.先说一说下面各题的运算顺序，再计算。（1）（476－23×4）÷6＝（476－92）÷6＝384÷6＝64巩固练习四 www.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.com（2）846÷[6×（31－28）]＝846÷[6×3]＝846÷18＝47巩固练习四1.先说一说下面各题的运算顺序，再计算。 www.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.com2.计算下面各题，怎样简便就怎样计算。（1）142＋914＋58＋86（2）35×125×8＝（142＋58）＋（914＋86）＝200＋1000＝1200＝35×（125×8）＝35×1000＝35000想一想每道题应用了什么运算定律。巩固练习四 www.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.com想一想每道题应用了什么运算定律。＝356－（127＋73）＝356－200＝156（4）75×101＝75×（100＋1）＝75×100＋75×1＝7500＋75＝7575（3）356－127－732.计算下面各题，怎样简便就怎样计算。巩固练习四 www.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.com（5）4800÷25÷4（6）56×99＋56＝4800÷（25×4）＝4800÷100＝48＝56×99＋56×1＝56×（99＋1）＝56×100＝5600巩固练习四想一想每道题应用了什么运算定律。2.计算下面各题，怎样简便就怎样计算。