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# 义务教育课程标准试验教科书 数学 八年级 上册 - PowerPoint PPT Presentation

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§15.2.1

2012年12月7日

（一）教材中的地位、作用

（二）教学重点、难点

（一）课前预习

（1）(x+1)(x-1)=____

（2）(m+2)(m-2)=____

（3）(2x+1)(2x-1)=____

（1）x2-1（2）m2-4（3）4x2-1

（二）数形结合，看清道理

=

（三）剖析公式，发现本质

(a+b)(a-b)=a2-b2

（四）巩固应用，讲解例题

(1)(x+2)(x-2)= x2-2

(2)(-3a-2)(3a-2)= 9a2-4

(3)(-3a＋2)(3a-2)= 9a2-4

(4)(-5-xy)(-xy+5)= xy2-25

(5)(m-n)(m+n)= m2-n2= (m-n)2

（四）巩固应用，讲解例题

（四）巩固应用，讲解例题

（1）（x+y )( x-y) (x2+y2 )=____

（2）（y+2 )( y-2) -(y-1 ) (y+5 )=____

（五）拓展深化，发展思维

（1）102× 98=____

（2）20112－ 2008×2014=____

（七）课后练习，布置作业

（1）必做题：习题15.2第1题

（2）选做题：

(2＋1)(22＋1) (24＋1) (28＋1) … (232＋1)