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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。 查看更多

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