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免费2018年德州市中考数学一轮复习《1.3分式》课件+随堂演练含真题分类汇编解析随堂演练1.若分式x-2x+1的值为0,则x的值为()A.2或-1B.0C.2D.-12.(2016·台州)化简x2-y2(y-x)2的结果是()A.-1B.1C.x+yy-xD.x+yx-y3.(2017·济南)化简a2+aba-b÷aba-b的结果是()A.a2B.a2a-bC.a-bbD.a+bb4.(2017·泰安)化简(1-2x-1x2)÷(1-1x2)的结果为()A.x-1x+1B.x+1x-1C.x+1xD.x-1x5.如果分式2xx+3有意义,那么x的取值范围是_________.6.(2017·枣庄)化简:x+3x2-2x+1÷x2+3x(x-1)2=________.7.(2017·潍坊)计算:(1-1x-1)÷x-2x2-1=_________.8.(2017·青岛)化简:(a2b-a)÷a2-b2b.9.(2017·滨州)(1)计算:(a-b)(a2+ab+b2);(2)利用所学知识以及(1)所得等式,化简代数式m3-n3m2+mn+n2÷m2-n2m2+2mn+n2.10.(2016·烟台)先化简,再求值:(x2-yx-x-1)÷x2-y2x2-2xy+y2,其中x=2,y=6.参考答案1.C2.D3.D4.A5.x≠-36.1x7.x+18.解:原式=a(a-b)b·b(a+b)(a-b)=aa+b.9.解:(1)原式=a3+a2b+ab2-a2b-ab2-b3=a3-b3.(2)原式=(m-n)(m2+mn+n2)m2+mn+n2·(m+n)2(m+n)(m-n)=m+n.10.解:原式=x2-y-x2-xx÷(x+y)(x-y)(x-y)2=-(x+y)x·x-yx+y=-x-yx,当x=2,y=6时,原式=-2-62=3-1.
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