北师大版七年级下册第一章整式的乘除复习巩固讲义(全)

1.nmnmaaa(mn)2.mnnmaa(mn)3.nnbaabn(n)4.nmaaanm(a0,mnmn).5.010.aa6.1nnaaa0n2xaxbxabxab1.22()()ababab2.2222abaabb2222)(bababa24323233cbacbaabmcmbmacbamnbnambmabanm2322432323cbaabcbacbammcmmbmmammcmbam111A.1055aaaB.1055aaaC.2045aaaD.954aa2A.333273-baabB.4622316141babaC.632xyxyD.68234-baba226mnmxxx36m,29n,2413______mn.1A.1553aaaB.326aaaC.853aaaD.34aaa2A.632-xxxB.323--xxxC.222224xxxD.63282xx320122012532-135A.-1B.1C.0D.19974,23,83nm1323nm=23134221()()54abab2232223(5)().abcabc36334533693()45105abababab41xxyxx2)1()2(23,31yx222242222yyxyxyxyx212yx11534123xyzxy224323221(4)()(4);4ababcabc3)21()213(22xyxyxyyx463223(2)(3)[(2)]aaa5222223366mmnmnm622224754xyyxxyyx71222aaa8231235xyxy212122mnmnmn21,2nm2yyxyyxyx21)(22221,21yx312)3()32)(32(bababa31,5ba2,13,53122xxBxxA32xBA235mnaaaa1mm=n19273xx2528162xxx322383515xxxx11227327mmm2192221232xxx31020a1105b293ab4228xy993yxx+2y530,5yxxaayxaa623m24n322mn75,3baxxbax23=A.2527B.109C.53D.52843,53nmnm23=B.425B.6C.=21D.2090352yxyx324103,5nnbanab24618,6xyyx22yx=.20192mm22mm=.328182xxkk.10152xx22xx=.2a22200720092aa20072009aa=.322169ymxyxm=.416)3(22mxx________m51226922yyxyxxy=.6a+b=3,a2+b2=5ab710mn24mn22mn.810,8xyyx,22yx=.843,322xyyxyx33xyyx571621xaxxa)A.0B.1C.2D.32qxxpxx38222x3xp1(x1)(x25axa)2a213xmxxm______3k=,8313322xyykxyxxy412bxax1322xx3xxab4x+mx+3xm63222xxqpxx2x3xp