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,测素质,冀教,版,七,年级,下,第,8,章,整式的乘法,集训课堂,幂的运算和整式的乘法,D,D,1,2,3,4,5,D,B,6,7,8,D,答 案 呈 现,温馨,提示,:,点击,进入,讲评,习题链接,9,C,10,11,12,C,B,a,12,100,1,13,14,温馨,提示,:,点击,进入,讲评,习题链接,15,16,17,答 案 呈 现,4.5,18,D,1,计算,a,2,a,4,4(,a,2,),3,的结果是,(,),A.,a,6,2,a,5,B,a,6,C,a,6,4,a,5,D,3,a,6,下列运算正确的是,(,),A,a,(,a,1),a,2,1,B,(,a,2,),3,a,5,C,3,a,2,a,4,a,3,D,a,5,a,2,a,3,2,D,3,D,若,3,x,a,,,3,y,b,,则,3,2,x,y,等于,(,),A,a,2,b,B,a,2,b,C,2,ab,D,a,2,b,B,4,【,2021,恩施州】下列运算正确的是,(,),A,7,a,3,3,a,2,4,a,B,(,a,2,),3,a,5,C,a,6,a,3,a,2,D,a,(,a,1),a,2,a,D,5,6,C,7,C,要使,x,(,x,a,),3,x,2,b,x,2,5,x,4,成立,则,(,),A,a,2,,,b,2,B,a,2,,,b,2,C,a,2,,,b,2,D,a,2,,,b,2,若,(,x,2,ax,2)(,x,2,3,x,b,),中不含,x,2,和,x,3,项,则,a,,,b,的值分别为,(,),A,0,,,0,B,3,,,7,C,3,,,8,D,3,,,1,8,B,计算:,2(,a,2,),6,(,a,3,),4,_.,9,a,12,10,已知,2,x,3,y,2,0,,则,(10,x,),2,(10,y,),3,_,11,100,已知单项式,9,a,m,1,b,n,1,与,2,a,2,m,1,b,2,n,1,的积与,5,a,3,b,6,是同类项,则,mn,_,12,1,【,点拨,】,9,a,m,1,b,n,1,(,2,a,2,m,1,b,2,n,1,),18,a,3,m,b,3,n,,,因为,18,a,3,m,b,3,n,与,5,a,3,b,6,是同类项,,所以,3,m,3,,,3,n,6,,解得,m,1,,,n,2,,所以,m,n,1,2,1.,【,点拨,】,已知,a,m,3,,,a,n,2,,则,a,2,m,n,的值为,_,13,5,观察,(1),中的杨辉三角及,(2),中的等式:,(1),(,a,b,),1,a,b,(,a,b,),2,a,2,2,ab,b,2,(,a,b,),3,a,3,3,a,2,b,3,ab,2,b,3,14,(,a,b,),4,a,4,4,a,3,b,6,a,2,b,2,4,ab,3,b,4,(2),根据,(2),中各式的规律,得,(,a,b,),6,_,a,6,6,a,5,b,15,a,4,b,2,20,a,3,b,3,15,a,2,b,4,6,ab,5,b,6,计算,:,(1)(,a,1)(,a,1),(,a,2)(,a,3),;,15,解,:原,式,a,2,a,a,1,(,a,2,3,a,2,a,6),a,2,1,a,2,a,6,a,5,;,解,:原式,a,3,(,8,a,3,b,6,),28,a,6,b,6,2,a,2,b,5,20,ab,2,8,a,6,b,6,28,a,6,b,6,2,a,2,b,5,20,ab,2,20,a,6,b,6,2,a,2,b,5,20,ab,2,.,16,(2),(2,x,y,),13,(2,x,y,),3,2,(,y,2,x,),2,3,,其中,x,2,,,y,1.,解:原式,(2,x,y,),13,(2,x,y,),6,(2,x,y,),6,(2,x,y,),13,6,6,2,x,y,.,当,x,2,,,y,1,时,,原式,2,x,y,22,(,1),5.,【,教材,P,82,习题,A,组,T,4,变式】解方程,(1)2,x,(,x,1),12,x,(2,x,5),;,17,解:,去括号得,,2,x,2,2,x,12,2,x,2,5,x,.,移项、合并同类项得,,3,x,12.,系数化为,1,得,,x,4.,(,2,)(,x,3)(,x,8),(,x,4)(,x,7),2(,x,5),;,解,:,(,x,3)(,x,8),(,x,4)(,x,7),2(,x,5),,,x,2,5,x,24,x,2,3,x,28,2,x,10.,5,x,3,x,2,x,28,10,24.,6,x,6.,x,1.,【教材,P,85,习题,A,组,T,6,变式】,如,图,某校有一块长为,(3,a,b,)m,、宽为,(2,a,b,)m,的长方形空地,中间是边长为,(,a,b,)m,的正方形草坪,其余为活动场地,学校计划将活动场地,(,阴影部分,),进行硬化,18,(,1),用含,a,,,b,的式子表示需要硬化的面积并化简;,解,:需要,硬化的面积为,(3,a,b,)(2,a,b,),(,a,b,),2,6,a,2,3,ab,2,ab,b,2,(,a,2,2,ab,b,2,),6,a,2,3,ab,2,ab,b,2,a,2,2,ab,b,2,5,a,2,3,ab,(m,2,),(2),当,a,5,,,b,2,时,求需要硬化的面积,解:,当,a,5,,,b,2,时,,,5,a,2,3,ab,55,2,352,155.,答:需要硬化的面积为,155 m,2,.,
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