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,第,二章 整式的加减,基础专题 整式的化简与求值,类型一整式的加减运算,1.,计算:,(,1,),22b,13a,15a,16b,;,解:原式,22b,16b,13a,15a,6b,2a.,(,2,),x,2,(,2x,1,)(,3x,5,);,解:原式,x,4x,2,3x,5,3.,(,3,),3,2,(,1,2x,3x,2,);,解:原式,6x,2,4x,3,2,4x,6x,2,5.,(,4,),2a,2,3a,2,4,(,a,2,2a,),2,;,解:原式,2a,2,3a,2,4,(,a,2,2a,),2,3a,2,8a,2.,(,5,),2a,2, ,ab.,解:原式,2a,2, ,ab,2a,2,ab,2a,2,8ab,ab,4a,2,9ab.,2.,已知,A,x,2,2x,1,,,B,2x,2,6x,3,,化简下列各式:,(,1,),A,2B,;,(,2,),2A,B.,解:(,1,)原式(,x,2,2x,1,),2,(,2x,2,6x,3,),5x,2,14x,7.,(,2,)原式,2,(,x,2,2x,1,)(,2x,2,6x,3,),2x,1.,类型二整式的化简求值,3.,先化简,再求值:,(,1,),2,(,a,2,3a,2,),3,(,2a,2,),其中,a,2,;,解:原式,2a,2,10.,当,a,2,时,,原式,2,(,2,),2,10,2.,(,2,),2x,y,(,2y,2,x,2,)(,x,2,2y,2,),其中,x, ,,y,3,;,解:原式,2x,2,2x,y.,当,x, ,,y,3,时,,原式,2,1,(,3,),.,(,3,),2,(,a,2,b,ab,2,),3,(,a,2,b,1,),2ab,2,1,,其中,a,2,,,b, ;,解:原式,a,2,b,4.,当,a,2,,,b, 时,,原式,2,2,4,3.,(,4,)(,5a,2,3a,1,),3,(,a,a,2,),其中,a,2,2,0,;,解:原式,2a,2,1.,因为,a,2,2,0,,即,a,2,2,,,所以原式,3.,(,5,)(,ab,3a,2,),2b,2,25ab,(,a,2,2ab,),,其中,a,1,,,b,2.,解:原式,13ab,a,2,2b,2,.,当,a,1,,,b,2,时,,原式,131,(,2,),1,24,17.,
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