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,第十四章整式的乘法与因式分解,人教版,141整式的乘法,第,5,课时单项式乘以多项式,单项式与多项式相乘,,,就是用单项式去乘多项式的,_,,,再把,_,每一项,所得的积相加,1,(3,分,),(2017,台湾,),计算,6x(3,2x),的结果,,,与下列哪一个式子相同,(),A,12x,2,18x,B,12x,2,3,C,16x,D,6x,2,(3,分,),若一个长方体的长、宽、高分别为,2x,,,x,,,3x,4,,,则长方体的体积为,(),A,3x,3,4x,2,B,6x,2,8x,C,6x,3,8x,2,D,6x,3,8x,A,C,B,4,(6,分,),计算:,(1),6x(x,3y),;,解:原式,6x,2,18xy,(2)(,2xy),2,(3x,3,y,x,4,yxy,2,),解:原式,12x,5,y,3,4x,7,y,5,5,(6,分,),先化简,,,再求值:,3a(a,2,2a,1),2a,2,(a,3),,,其中,a,2.,解:原式,a,3,3a,,,当,a,2,时,,,原式,14,D,解,:原式,3a,3,b,2,3a,2,b,3,3a,2,b,2,2a,3,b,2,3a,2,b,3,2a,2,b,2,a,3,b,2,5a,2,b,2,解,:,5x,2,5x,15,24x,4x,2,x,2,4x,0,,,15x,15,,,x,1,
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