培优分式(含答案)

经典word整理文档，仅参考，双击此处可删除页眉页脚。本资料属于网络整理，如有侵权，请联系删除，谢谢！A定义：（A、B为整式，B中含有字母）BAAMBBM(M(M通分：性质AAM约分：BBM51分式定义：分母含有未知数的方程。如13xx思想：把分式方程转化为整式方程方法：两边同乘以最简公分母分式方程解法依据：等式的基本性质注意：必须验根应用：列分式方程解应用题及在其它学科中的应用例若ab1011，a1b111，a1b1a，b1ab10abb0即ba0b10a10或11，a1b1-1-a2a1a2a1a3例a1a(a1a(a1a11a31)a(aa1a311a1a3(a(a(aa2a2(aa1x5x52例解方程：1x27x6x25x67x6(xx6)x5x6(x2)(x分析：因为x2，2(xxx2)(xxx225x5x25x61115x6x5x6x5x622x25x6111x25x6x25x611原方程变为11x27x6x25x611x27x6x25x6x7x6x5x622x00x例a2a9|b与4abaab2ba2()abbab2222222-2-分析：要求代数式的值，则需通过已知条件求出a、b的值，又因为a2a9(a20，|b0ba30，b10ab14abab2ba2[](ab)(ab)abba)ab(ab)(ab)2ababbba222[]ab(ab)(ab)ab(ab)(ab)2ab(ab)bab(ab)(ab)(ab)(ab)a1aabb1b1把a12例3x时45014503x3x2x540042x450030x75xx752y3x(3x2)(3y2)13例x。3y22y33y23xy2x2y3x3xy2y2x3(3x2)y2x32x3y3x2-3-y3y26y96y43y2(32)x23y2(3x2)(3y2)M2xyy2xy例。xyx2y2xy22。2xyyxy2yxyx222xyyx2xyy222x2y2x2xx22y22MyMx2(xx132例x23x20。x1x23x(x(xx2x1x1x3x222x3x20x3x222原式x23x2|x2例当xx23x2x3x2(xx2)0x212得x或1x2x和|x20x2得-4-x2当x3x202当x2x23x20|x2x2x23x2x22(mn)xx2mn212mn23例求x。x(mn)xx22(x)(xn)(x)(x)(x)(xn)(xn)(xn)(x)2(xn)2123mnx2116x2xn，mn4(x)(xn)(2m)(3nn)22原式221()2m92414n2164()26当x2x111xQt0）-5-4y4xy22x2y2y42yx2xx2x4x6x8x1x3x5x732xyz4x3y6z0，x2y7z00xy2z-6-【试题答案】0x110x0x1x且0x1当x且QQmc(tt)tt00Qtt0Q(t)mc。0(x2yx2y)4yx2y4xy22(2yx)(2yx)x24xx2y(x2y)(x2y)2xy4x(x2y)(x2y)(x2y)(x2y)(x2y)2yx322yx2x2x2y11111111x1x3x5x71111x1x3x5x722(xx(xx7)(xx7)(xx8x324x4x-7-11xxx3