分式的加减法习题

111.DDx 二 DDDDx 4 + x 2 — 6 ODDx2+3AD0BDCDD1DDD2A.二 2^B.x+yx+yCD.DDDDD3.DDD111+二 DDDaba+bab+DD(AD1BDD1CD2DDD2□□□□□□□□□□aDDDDDD41. DDD2-=Dx+22.DDD—+—^=Da+bb+a4aa3.D^——,——DDDDDDD.3bc5c2314.DDD——+——=D2xy4x221-3x5.DDDDDDDx—12—2x5236.DDD—+=D6ab3ac4abcm=2 xy - y 2 +x — y 叮 x2-y2x2-y2x+y8.DDD2DDDDDDDDy=Dy2-1y+1y-1DDDDDD2y22.DDx-y+DDDDDx+y4.DD(m——)十(n—)DDDD()nmmnAD1BD——CU—DDD1nm5.DD1+1+■—DDDDx2x3x13115AH—BCDDU 丄2x2x6x6xD4mDDDDDDDDDDDDDDDDDD2x2—y9—yD1D—(x—3)2(3—x)2D3D2y+1AB2肌(y 一 l)(y+2)=口+7^2 兀 A"B皿xx+6333.DDDDDDD—-x+ODDx=Dx 一 3x2 一 3xx24.DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD3aa+b7b6.U+DDa 一 4b4b 一 aa—4b2a+6b2a+6bADBa 一 4ba 一 4bDDDDD1.DDDCD—2DD26x+4x2y6a + b 4a2b3□□□□□□□□□□□□□□□aODDDDDD31+—2xy4x2DDDDDDDDDDDDDDDDDDD35.ODD-D221-3x23x-13(x-1)3ODDDDDD————一x 一12—x一 112x-1LI2x—1D2DDDDDDDDDDDDDDDDDDD.10c-8b+96.ODD■D12abc52310c8b910c-8b+9ODDDDDD—+—+_6ab3ac4abc12abc12ac12ab12abcDDDDDDDDDDDDDDDDDDD7.ODDx2DDDDDD1.ODD2xx+2ODDDDDD42(x+2)4_2x+44_2xx+2x+2x+2x+2x+2x+2DDDDDDDDDDDDDDDDDDD2.DDD1DODDDDDDababa+b”+_+__1a+bb+aa+ba+ba+bDDDDDDDDDDDDDDDDDDD3.ODD15bc2 口ODDDDDDDD 匹□—DDDDDDD3bc5c215bc2DDDDDDDDDDDDDDDDDD4.ODD6x +y D4x2y