八年級數(shù)學(xué)上冊15.2.1分式的乘除同步練習(xí)(新版)新人教版【教案】

1、1.2)21“分式的乘除法”復(fù)習(xí)題三.選擇題填空題約分:2m 2m 1a31b3nJ2a2.1.2.3.4.5.1 -m計算:4(2e)(-x)ab2c)23e24ab3be2a22n 13n_2（n為正整數(shù)）(-xy2)b22x112x)11；(xy -x2)-2xyxy判斷題 下列運算正確的打I)3z32I)2z（斗a2b3（一盲）9x y2zy3z3錯誤的打“X”2xxb4n2na（n為正整數(shù)）（8b927a6327114A.B.c.D.4262132.在分式,6xy2 2x - yy x33,x2中，最簡分式有,(x - y)23x2x 2y2 2x y2 2x - y（x-y）2的值

2、是（2 2x -y1.2)221.已知x: y = 3，則分式)A. 1個B. 2個C. 3個D. 4個3計算2z3x3 / 3. 3 . . /()(a -b )-(a by2+(a+b)y+ab a2_x23.x2-(a b)x ab b2_ y24.x -x-6 x -3x-10 2(x-5)3.F列各式正確的是（A.2 2x -yC.2bB.2x 2x1D.22x - x -1-(a2b1.8x23x6z4yb _ a2)2b a2.5.42x -6x1 2x - 6廠廠小3)_3二廠23x x 11-x22x 11 xa27a 10 a31 a2- a 1- +-2 26.-(x2x

3、-2)5.58.2 , 2)2ab(a-b9.6(a2x2)3(a22ax x2)21a2x2a4_x4(a2_ax x2)2222a b -c -2ab222a -b c -2ac2 , 2 2 ,a -b -c2 bc-22 2a b -c2 abxy y.2xy y(x-y)212.2 3yx-x -3211y3213.X32x2x 22x 4x 42 2x - 4x 4. x 13x -2x -x 2 x -110.14.72x -1612-4x2 x -4x 4 x -4a7b2(a2b2)4a2(b a)33( a b)a221 6.2 2(8a -2b )4a2b 4ab2b32

4、2-2b -5ab -3ab2 2b -5ab 6a11，其中a,b =。24- (x 2)15.14.89【試題答案】1.2.2424a b c ；91.1. 27 a . x y y.4； 1；. 15；abby - x1.x2.x3.X4.1. C 2. B 3. B四.23x 6z 36 xz1.解：原式=8x232廠4y x y y2.解:原式27x9(a b)3(a -b)(a2ab b2)2(a b)22(b -a )22927(a-b)(a ab b )x(a + b)(b_a2)23.解：原式=(y a)(yb)(ax)(a-x)(xa)(xb) (b + y)(by)(y

5、a)(x a) (x-b)(b - y)(y a)(x a) (x-b)(y -b)4.解：原式2(x-3) (x-5)(x2)(x_3)(x2) (x 3)(x _3)x 32(x-5)5.解：原式2(x-3)1 (x 3)(x-2)2-.-2(x-2) x 33-xx-26.解：原式x2x 1(1 _x)(x2X 1)1(x 2)(x-1)2(1 x )(x2)7.解: 原式8.解: 原式9.解: 原式x21-x-2(a 2)(a 5)(a 1)(a2-a 1)(a 1)(a 5)(a 2)2a2- a 1=12-2a b(a-b)3a2b2b2(a x)3(aX)3(a2x2)(a x)

6、(a -x)1(a b)2(ab)2a3(a b)2244+(a x)(a -x)a3ax2a(a b)21010.解:11a 6a 5 a 4a 4 a 211.解:12.解:13.解:14.解:15.解:16.解:原式(a -b c)(a -b -c) (a b c)(a b -c)(a+b _c)(a _b _c) (a+b _c)(a _b + c)2原式二(Xy)y(x y)(x y)(x一y)原式原式原式原式原式ab cab -c2x 3yx2x -3yx2x3y62x 3y62x 3y2x-3yx2(x 2) (x 2)(x 2)2(x21)(x 2)(x 2)2x-2x 22(X-8)(x-2)272a b3(a b)2x_3y =12x 3y(X - 2)2(x 1)(x 1)X2(X-2)-(X-2)(x - 2)2(x 1)(x _1)(x _2)(x 2)(x-2)4(3-x)(a b)4(a - b)4x21(x 1)(x-1)x21x -82(3-x)(x-2)8(a b)3b2(a -b)a6(b -