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单击此处编辑母版标题样式,编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,第,14,课时,整式的乘除,单元复习,第一章,整式的乘除,第14课时 第一章 整式的乘除,目录,contents,课前小测,课堂精讲,课后作业,目录contents课前小测课堂精讲课后作业,课前小测,目录,contents,课前小测目录contents,课前小测,Listen attentively,知识小测,1,(,2016,春,乳山市期末)下列各式中,不能用平方差公式计算的是(),A,(,x+y,)(,xy,),B,(,x,2,2y,2,)(,x,2,+2y,2,),C,(,x+yz,)(,zy+x,),D,(,2xy,)(,y2x,),2,计算,2x,3,3x,2,的结果是(),A,5x,5,B,6x,6,C,5x,6,D,6x,5,3,(,2015,成都)下列计算正确的是(),A,a,2,+a,2,=a,4,B,a,2,a,3,=a,6,C,(,a,2,),2,=a,4,D,(,a+1,),2,=a,2,+1,A,D,C,课前小测 Listen attentively知识小测A,课前小测,Listen attentively,4,(,2015,春,温州期中)计算:,(,6a,3,b,4,),(,3a,2,b,),=,(),A,2B,2ab,3,C,3ab,3,D,2a,5,b,5,5,(,2014,秋,鞍山期末)在电子显微镜下测得一个圆球体细胞的直径是,510,5,cm,,,210,3,个这样的细胞排成的细胞链的长是,6,若,x,m,=16,,,x,n,=2,,(,x0,),求,x,m+n,=,7,(,2013,秋,高新区期末)与单项式,3a,2,b,的积是,6a,3,b,2,3a,2,b,2,+9a,2,b,的多项式是,8,(,2015,春,吴中区期中)计算:,2009,2,20082010=,B,0.1,32,2ab+b3,1,课前小测 Listen attentively4(20,课堂精讲,目录,contents,课堂精讲目录contents,课堂精讲,Listen attentively,本章小结,课堂精讲 Listen attentively本章小结,课堂精讲,Listen attentively,【,例,1,】,(,2016,苏州)下列运算结果正确的是(),A,a+2b=3ab,B,3a,2,2a,2,=1,C,a,2,a,4,=a,8,D,(,a,2,b,),3,(,a,3,b,),2,=b,解:,A,、,a+2b,,无法计算,故此选项错误;,B,、,3a,2,2a,2,=a,2,,故此选项错误;,C,、,a,2,a,4,=a,6,,故此选项错误;,D,、(,a,2,b,),3,(,a,3,b,),2,=b,,故此选项正确;,故选:,D,D,课堂精讲 Listen attentively【例1】(,课堂精讲,Listen attentively,【,类比精练,】,1,(,2016,陕西)下列计算正确的是(),A,x,2,+3x,2,=4x,4,B,x,2,y2x,3,=2x,4,y,C,(,6x,2,y,2,),(,3x,),=2x,2,D,(,3x,),2,=9x,2,解:,A,、原式,=4x,2,,错误;,B,、原式,=2x,5,y,,错误;,C,、原式,=2xy,2,,错误;,D,、原式,=9x,2,,正确,,故选,D,D,课堂精讲 Listen attentively【类比精练,课堂精讲,Listen attentively,【,例,2】,(,2016,丰台期末)化简:(,x+2y,),2,(,x+y,)(,xy,),5y,2,解:原式,=x,2,+4xy+4y,2,x,2,+y,2,5y,2,=4xy,解:,(,2xy,)(,2x+y,),+y,(,y6x,),2x,=,(,4x,2,y,2,+y,2,6xy,),2x,=,(,4x,2,6xy,),2x=2x3y,【,类比精练,】,2,(,2016,江西模拟)计算:,(,2xy,)(,2x+y,),+y,(,y6x,),2x,课堂精讲 Listen attentively【例2】(,课堂精讲,Listen attentively,【,例,3】,(,2016,瑞昌期中)先化简,再求值:,(,x+2y,)(,x2y,),(,x+4y,),2,4y,,,其中,x=1,,,y=4,解:原式,=,(,x,2,4y,2,x,2,8xy16y,2,),4y,=,(,8xy20y,2,),4y=2x5y,,,当,x=1,,,y=4,时,原式,=220=22,课堂精讲 Listen attentively【例3】(,课堂精讲,Listen attentively,【,类比精练,】,3,先化简,再求值:,(,2x+y,),2,y,(,y+4x,),8xy,(,2x,),其中,x=2,,,y=1,解:原式,=4x,2,+4xy+y,2,y,2,4xy8xy,(,2x,),,=,(,4x,2,8xy,),(,2x,),,=2x+4y,当,x=2,,,y=1,时,原式,=22+4,(,1,),=44=8,课堂精讲 Listen attentively【类比精练,课后作业,目录,contents,课后作业目录contents,课后作业,Listen attentively,4,计算(,a,2,),3,,正确结果是(),A,a,5,B,a,6,C,a,8,D,a,9,5,(,2016,丽水)计算,3,2,3,1,的结果是(),A,3B,3 C,2D,2,6.,纳米是一种长度单位,,1,纳米,=10,9,米,某花粉的直径约为,3.56,纳米,这个数据用科学计数法表示为()米,A,3.5610,9,B,0.3610,10,C,3.610,9,D,3.510,9,B,A,基础过关,A,课后作业 Listen attentively4计算(,课后作业,Listen attentively,7,(,2016,普宁期末)若,2xy=16x,3,y,2,,则内应填的单项式是(),A,4x,2,yB,8x,3,y,2,C,4x,2,y,2,D,8x,2,y,8,(,2016,商河期末)下列算式能用平方差公式计算的是(),A,(,2a+b,)(,2ba,),B,C,(,3xy,)(,3x+y,),D,(,mn,)(,m+n,),9,已知,6m,5,n,x,2m,y,n,3,=3m,2,n,2,,则(),A,x=3,,,y=2B,x=5,,,y=3,C,x=3,,,y=5D,x=2,,,y=3,D,D,B,课后作业 Listen attentively7(20,课后作业,Listen attentively,10,(,2016,瑶海期中)已知(,x+a,)(,x+b,),=x,2,13x+36,,则,a+b=,(),A,5 B,5 C,13D,13,或,5,11,(,2016,岱岳期末)若,(,2a5,),2,=4a,2,10ka+25,,则,k=,12,计算:(,p,),2,(,p,),=,13,(,2016,江宁一模)计算:(,3a,3,),2,=,C,2,p,3,9a,6,课后作业 Listen attentively10(2,课后作业,Listen attentively,14,计算:(,5mn,3,),7m,2,n,2,=,15,(,3x+5y,),=9x,2,25y,2,16,计算:(,a+b,),2,2ab,35m,3,n,5,(,3x5y,),解:原式,=a,2,+2ab+b,2,2ab=a,2,+b,2,课后作业 Listen attentively14计算,课后作业,Listen attentively,17,(,2016,门头沟期末)化简:,(,8a,2,b4ab,2,),(,4ab,),解:(,8a,2,b4ab,2,),(,4ab,),=2a+b,课后作业 Listen attentively17(2,课后作业,Listen attentively,18,计算与求值:,(,1,)(,),2,(,2016,),0,+,(),11,(,),12,;,(,2,)(,3x2,),2,+,(,3+x,)(,x3,);,(,3,)(,9x,4,y,3,6x,2,y+3xy,2,),(,3xy,),.,(,2,)(,3x2,),2,+,(,3+x,)(,x3,),,=9x,2,12x+4+9x,2,,,=8x,2,12x+13,;,课后作业 Listen attentively18计算,课后作业,Listen attentively,19,已知,a,x,=5,,,a,x+y,=30,,求,a,x,+a,y,的值,(,3,)(,9x,4,y,3,6x,2,y+3xy,2,),(,3xy,),,=9x,4,y,3,(,3xy,),6x,2,y,(,3xy,),+3xy,2,(,3xy,),,=3x,3,y,2,+2xy,;,解:,a,x,=5,,,a,x+y,=30,,,a,y,=a,x+yx,=305=6,,,a,x,+a,y,=5+6=11,,,即,a,x,+a,y,的值是,11,课后作业 Listen attentively19已知,课后作业,Listen attentively,20,先化简,再求值:(,a2b,)(,a+2b,),(,a5b,)(,a+3b,),其中,a=1,,,b=1,解:(,a2b,)(,a+2b,),(,a5b,)(,a+3b,),=a,2,4b,2,a,2,3ab+5ab+15b,2,=11b,2,+2ab,,,当,a=1,,,b=1,时,原式,=9,课后作业 Listen attentively20先化,课后作业,Listen attentively,21,问题:阅读例题的解答过程,并解答(,1,)(,2,):,例:用简便方法计算,195205.,解:,195205,=,(,2005,)(,200+5,),=200,2,5,2,=39,975.,(,1,)例题求解过程中,第步变形依据是,(填乘法公式的名称),(,2,)用此方法计算:,9910110001,能力提升,课后作业 Listen attentively21问题,课后作业,Listen attentively,解:(,1,)平方差公式,(,2,),9910110001=,(,1001,)(,100+1,),10001,=,(,100001,)(,10000+1,),=1000000001=9999999=10,8,1,课后作业 Listen attentively解:(1),课后作业,Listen attentively,22,一个棱长为,10,3,的正方体,在某种物体作用下,其棱长以每秒扩大到原来的,10,2,倍的速度增长,求,3,秒后该正方体的棱长,解:由题意,得,10,3,10,2,10,2,10,2,=10,3+2+2+2,=10,9,答:,3,秒后该正方体的棱长,10,9,课后作业 Listen attentively22一个,谢,谢,观,看,!,谢,
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