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,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,单项式乘单项式,鲁教版五四六年级下,第,6,章整式的乘除,6.5.1,A,C,1,2,3,4,5,D,C,6,7,8,A,答案呈现,温馨提示,:,点击 进入讲评,习题链接,9,C,10,B,2,11,12,1,13,14,15,16,温馨提示,:,点击 进入讲评,习题链接,计算,2a35a3,的结果是,(,),A,10a6,B,10a9,C,7a3,D,7a6,A,1,下列,计算正确的是,(,),A,a,2,a,2,a,4,B,2,a,a,1,C,2a(,3,a,),6,a,2,D,(,a,2,),3,a,5,2,C,3,D,下面,是某同学在一次测试中的计算:,3m2n,5mn2,2mn,;,2a3b(,2a2b),4a6b,;,(a3)2,a5,;,(,a3)(,a),a2.,其中运算正确的个数为,(,),A,4B,3C,2D,1,若,等式,2a2a,3a3,成立,则填写单项式可以是,(,),A,a,B,a2,C,a3,D,a4,C,4,若,(8106)(5102)(210),M10a(1M10,,,a,为整数,),,则,M,,,a,的值为,(,),A,M,8,,,a,10,B,M,8,,,a,8,C,M,2,,,a,9,D,M,5,,,a,10,A,5,如图,已知四边形,ABCG,和四边形,CDEF,都是长方形,则它们的面积之和为,(,),A,5x,10y,B,5.5xy,C,6.5xy,D,3.25xy,6,C,如果单项式,2xa,4y2a,2,与,xb,1y16,是同类项,那么这两个单项式的积是,(,),A,2x6y16,B,2x6y32,C,2x3y8,D,4x6y16,7,B,若单项式,3,x,2,y,与,2,x,3,y,3,的积为,mx,5,y,n,,则,m,n,的值为,_,8,2,【,点拨,】,由题意得,m,3(,2),6,,,n,3,1,4.,故,m,n,6,4,2.,已知单项式,9am,1bn,1,与,2a2m,1b2n,1,的积与,5a3b6,是同类项,则,mn,_,9,1,【,点拨,】,9am,1bn,1,(,2a2m,1b2n,1),18a3mb3n.,因为,18a3mb3n,与,5a3b6,是同类项,,所以,3m,3,,,3n,6.,解得,m,1,,,n,2.,所以,mn,12,1.,10,(1),已知,2,x,3,y,2,(,3,x,m,y,3,)5,x,2,y,n,30,x,6,y,8,,求,m,n,的值,解:因为,2x3y2(,3xmy3)5x2yn,30 xm,5yn,5,30 x6y8,,,所以,m,5,6,,,n,5,8,,,即,m,1,,,n,3.,所以,m,n,4.,(2),已知,a,2,m,2,,,b,3,n,3,,求,(,b,2,n,),3,a,3,m,b,3,n,a,5,m,的值,解:,因为,a,2,m,2,,,b,3,n,3,,,所以,(,b,2,n,),3,a,3,m,b,3,n,a,5,m,(,b,3,n,),2,a,8,m,b,3,n,3,2,(,a,2,m,),4,3,3,2,2,4,3,9,163,9,48,39.,计算:,(1)(2,x,),3,(,5,xy,2,),;,11,解:,(2,x,),3,(,5,xy,2,),8,x,3,(,5,xy,2,),40,x,4,y,2,.,(2)(,2,ab,),3,(,ab,3,)(3,a,),2,.,解:,(,2,ab,),3,(,ab,3,)(3,a,),2,8,a,3,b,3,ab,3,9,a,2,8,a,3,b,3,9,a,3,b,3,a,3,b,3,.,【,点拨,】,对于几个单项式相乘的计算,若有乘方运算,应先算乘方,再算乘法本题在计算时往往容易弄错运算顺序而出错,12,计算:,(1),x,x,3,x,2,x,2,;,(2)5,x,2,y,(,2,xy,2,),3,;,解:,原式,x,4,x,4,2,x,4,;,原式,5,x,2,y,(,8,x,3,y,6,),40,x,5,y,7,;,(3)7,x,4,x,5,(,x,),7,5(,x,4,),4,.,解:,原式,7,x,4,x,5,(,x,7,),5,x,16,7,x,16,5,x,16,2,x,16,.,13,先化简,再求值:,(,3,a,3,x,)(,2,a,2,x,2,),2,7(,ax,),3,(,a,2,x,),2,a,7,x,5,,其中,x,2,,,a,1.,解:原式,(,3,a,3,x,)4,a,4,x,4,7,a,3,x,3,a,4,x,2,a,7,x,5,12,a,7,x,5,7,a,7,x,5,a,7,x,5,6,a,7,x,5,.,当,x,2,,,a,1,时,,原式,6(,1),7,(,2),5,192.,14,阅读下列解答过程,在横线上填上恰当的内容,(,2a2b)2(3a3b2)3,(,6a5b3)6,(,6)6(a5)6(b3)6,46656a30b18.,上述过程中,有无错误?答:,_,错在第,_,步,原因是,_,请写出正确的解答过程,有错误,弄错了乘方和乘法的运算顺序,解:正确的解答过程如下:,原式,4,a,4,b,2,27,a,9,b,6,108,a,13,b,8,.,15,三角表示,3abc,,方框表示,4xywz,,求,的值,解:,9mn(,4n2m5),36m6n3.,16,用,18,个棱长为,a,的正方体木块拼成一个长方体,有多种不同的拼法,请列举几种,分别表示所拼成的长方体的体积,你能得到什么结论?,(,至少写出两种拼法,),解:拼法不唯一,现列举三种,(1),长为,18,a,,宽为,a,,高为,a,,体积为,18,a,a,a,18,a,3,;,(2),长为,9,a,,宽为,2,a,,高为,a,,体积为,9,a,2,a,a,18,a,3,;,(3),长为,6,a,,宽为,3,a,,高为,a,,体积为,6,a,3,a,a,18,a,3,.,得到的结论:不管怎样拼,长方体的体积总是,18,a,3,.,
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