2016年數(shù)學(xué)中考復(fù)習(xí)專題(二)代數(shù)式

中考復(fù)習(xí)之專題二代數(shù)式教學(xué)準(zhǔn)備...1單項(xiàng)式——單項(xiàng)式的次數(shù)系數(shù)整式多項(xiàng)式—多項(xiàng)式的次數(shù)項(xiàng)數(shù)系數(shù)——升降冪排列2mnmnanmababnnnababab22aba2abb2223m(abcmmab(ab)(ab),22ab(ab),222ab(ab)(aabb)3322lxpxq,2＝q，a＋b＝p的a，b);ax2bxc(a0),xqxa)(xb2(bxc(axc)(axc).ccacacb的aaccax2aa1212122112121122.ax4bxc0(a0),ca(xx)(xx)。2xx么21212AAABBBAB5）ABa與ba與ba(mb0且bb。a0a1a(a0,p為正整數(shù)).papaaa,mnmnaaa(a0),mnmn(a)a,mn(ab)abnnnn06x則xaa。20x則xa3a。37①a(a0)(a)a(a0)2②④a(a0)abab(ab(a)2|a0(a0)③a(a0)ab(ab0)⑤ab8abab(a0,b0).）例題精講5xy例axy31與250nnmnma5a5m1n2m2m15m1n2m2m15①②a4mx9my(ab)2(ab)1例））2222）(ab22x5xy2y0225y25y16y225∴x∴xy44541541－y－y）44a2aak)a2k例2aaka1k）a32220＝31303例42）165例xx2x2xx232））x22x2121例0.8xy4a5b2n2n1，，1.4x2n1y2n15bc10ab2ac222acbc3ab34x3②,,10abc10abC10abc7y2例x3222222222x3x2x312x21x1x2x1x122(x21×＋(xx(x1xx112x＝＋＝x21x1x1當(dāng)＝2111例1a34a22a23a1，a41212a1a11a2()()例＝＝求10值aa12aa23a2213－123|a1|(a1a112＝1＝1＝2a(aa1a(aaa113,23當(dāng)＝－23a－＋233例11）x；x11）；）(x；）(2x)aax1x2a1x例xx22323233(22)22(22233222232121223833333333233388831318224415n≥24434444(4443244）15151541152nnnnnn(nnn332）nnn1n1n1n1n122222課后練習(xí).）a4a12a2x3x6x2a(a)6a(b)(b)b..326..34235mm把a(bǔ)6）2.6則y.5或3.3或5.3ａ5.）.）D.）D.5）2）.0.0.0D.0a2a）a2a2a2a2a2D.....1.2.3當(dāng)x）D.42）.1.1.1D.x.x。2xyy3x2若x6則k;2(2)2，9，。823；23，xy的。.112abb2b222ｂａａｃｃ2224－1ｘｙ2x2xy0求222－ｘ92練習(xí)答案試題答案..51312,423322xy.＋b112132b2＋b2＋b2222132＋＋b242b）02255）－＋22