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1、1•计算(x+y)J7?42.化简乎•甘丄_1a+4a+4分式计算题精选3.化简:(1一一)~raa+15.化简:4.化简:■二茴尹1存■a2-2ab+b2a2b-ab26.计算:(丄-旦)七亠X-11-XX-17.化简:y-34y~89•化简:11・计算:&化简:春/+3&.&+32a_a~b.a2-2ab+b2b_aaa+3a+2'a+1a+210计算:(1+2_x+1)亠x+4xx~2'x2~2x13•解方程:14.解方程:严八=()・X_1X(X_1)15•解方程:16.17解方稈:迪・-^-=1;"Ix2-11&x-l(2-疔
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3、3-岡19•已知a、b、c为实数,且满足(/?-V3)(c-2)+Vc2-41=0,求Fa-h的值。20.己知3x2+xy-2y2=0(兀HO,9220),求^_2_^±2L的值。yxxy^计算己知「rf1+兀丿kx2-l+X的值。rv322.解方程组:2‘丄丄1+牙丿I无?—1的值。24.1I—x+12'71+X1+对4+1+P2__2_3xx+y(x^y<3x2014寒假初中数学分式计算题精选参考答案与试题解析1计算x+y解:原式二(x+y)2x(x+y)(x~y)2化简其结果是—占s+2a-1亠12a2-1a2+4a+4出a
4、2-1解・・駆申)=+(a+1)(a-1)(a+1)(a-1)_a-1+2(a+1)(a-1)aH(a+1)(a-1)1"a-1*故答案为:—-—a-1解:原式窃歸92_.x+y亠xy2yx-3y°x2-6xy+9y2~—x-y—*解:i_x+y.x2-y2_t.x+yt(x-3y)2.x-3y_x-y-x+3y_2yx~3yx2-6xy+9y2x-3y(x+y)(x~y)x-yx-yx-y5化简:fa+b_4)丄a2-2ab+b2_1a2b-ab2a2-b2a2b-ab2_a+b解:原式=[a+babka_bJ4,(a-b)2(a-2
5、)•a-2-(8-3)a-2二z(a-2)(a+3)(s-3)(a+b)2-4ab(a-b)2(a-b)2ab(a-b)11二:二X(a+b)(a-b)ab(a-b)ab(a+b)(a-b)ab(a-b)ab(a+b)(a~b)(a-b)2a+l故答案为佥解原式二_x2+2xx-1X-1X=x+2.化简:厂34y~8三(y+2-y—3解:原式飞产三解:原式=(a+2"a-212a+6—-(a-3)2(a-2)(a+2)(a-2)a-25a-2((y+2)(y-2)_5)'7^2y_2y-3.y2-9y~3y-24y-8*y-2~4(y
6、~2)(y+3)(y~3)1"4(y+3)一14y+12*_-(a-3).(w+3)(a-3)2a+6化简:厲?+3厲.厲+32a2+3a+2°a+1a+2解:/+3d:n+32_nG+3)二寸打一2/+3計2a+1a+2(a+1)(a+2)a+3a+2a+2a+2=1,故答案为1.x(x+1)x(x~2)x(x-2)x+4解:原式$&-2)十竺二X(x-2)x(x-2)-(x+4)x(x-2)=•x(x-2)x+4=-1.计算1_a~b.a2-2ab+b2b_aa解:原式亠一口X—Ja_ba(a-b)2'_-1_1a-ba-b-1-1
7、a-b'a-b解:方程两边同乘(x・3),得:2-x-l=x-3,整理解得:x=2,经检验:x=2是原方程的解.解方程:解:设二y,则原方程化为丄y」+2y,3x-l22解之得,y—丄.3当尸■丄时,有■丄,解得X二・Z33x_133经检验x=-2是原方程的根.3・・・原方程的根是X—Z3解方程:严八=0.X-1X(.X-1)解:方程两边同乘X(X-1),得3x-(x+2)=0,解得:x=l.检验:x=l代入x(x・1)=0.・・・x=l是增根,原方程无解.解:(1)方程两边同乘(x-2)(x+1),得(x+l)解:方程两边都乘(x+l
8、)(x-1),得(x+l)2+4=x2-1,解得x=-3.检验:当x=-3时,(x+l)(x-1)工0,Ax=-3是原方程的解.解:方程两边都乘x(x-1),得3x・(x+2)二0解得:x=l.检验:当x=l时x(x-1)工0,+x-2=(x-2)(x+1),解得X二-丄4经检验X二-丄是原方程的解.4(2)方程两边同乘(x-1)(x+l),得x-1+2(x+l)=1,解得x=0.经检验x=0是原方程的解.解方程:(1)-2±L-~・・・x=1是原方稈的解.=1;⑵^--x-1/-1x-1