乘法交换律、乘法结合律四年级李凡香1、你能在下列的()内填上合适的数吗?28+320=320+()28(27+138)+62=27+(+...
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EvaluationWarning:ThedocumentwascreatedwithSpire..露傈塔赴旨刚伙贵嫩牧惺绍卵肌驼服晴趋私蔷慈爪荒捌熏...
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加法交换律:加法结合律:a+b=b+a(a+b)+c=a+(b+c)复习:乘法交换律和结合律每组要种5棵树,每棵树要浇2桶水。一...
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轻松课堂回忆:加法的运算律用字母表示为:a+b=b+a(a+b)+c=a+(b+c)猜想:乘法运算中有没有这样的运算律呢?口算...
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20X5=40X5=50X6=80X5=25X4=125X8=100口算题2003004001001000加法交换律:加法结合律:a+b=b+a(a+b)+c=a+(b+c)...
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EvaluationWarning:ThedocumentwascreatedwithSpire..加法交换律街子学区果什滩小学杨守英[教学目标]1.知识...
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EvaluationWarning:ThedocumentwascreatedwithSpire..加法交换律街子学区果什滩小学杨守英[教学目标]1。知识...
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绿色圃中小学教育网http://www.lspjy.com绿色圃中小学教育网http://www.lspjy.com四年级 下册第三单元乘法交...
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Evaluation Warning: The document was created with Spire.Doc for .NET.蔷元琉抗棺乳宣锑沛硷即土届狗字扁...
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7.一共有多少名同学参加了这次植树活动?(4+2)×25=6×25=150(人)4×25+2×25=100+50=150(人)所以,(...
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绿色圃中小学教育网http://www.lspjy.com绿色圃中小学教育网http://www.lspjy.com四年级 下册第三单元乘法交...
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Evaluation Warning: The document was created with Spire.Doc for .NET.扳昏慌嗽文置乾访巴愚含课爱匀缕靖...
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