分式的约分、通分经典练习题 1.不改变下列分式的值,使分式的分子、分母首相字母都不含负号。 ①xyxyy ② ③ x2yxyx 约分练习: 1.根据分数的约分,把下列分式化为最简分式: 125a2bc38a226ab26ab =_____;=_______=__________=________ 22212a45abc13ab13ab22、约分 3a3b3cxyyx2xyx2y2⑴ ⑵ ⑶ ⑷ 2222xy12acxyxy 3、约分:; 1. 15(ab)2x225a24a332a3b2ca2abx2x2 2. (3) (4) (5) ; (6) ; 25(ab)abx25xa2a624a2b3d4x2(ab)2c216a4b2c52bab6x2y2xy24.约分①2 ② ③ ④ abc12a3b4c2a2a9x2y2 m32m2m15mn210m2n2a2b2y(2yx)4⑤ ⑥ ⑦ ⑧ 22235mnm14a4b6x(x2y) x23x18xyab3a29x26x95.约分(1) (2) 2 (3) (4) 2x29x29a6a9xyab (6) 3yx12ax7x (7) 227axy49x2(5)x4x3 xx6222x2yxy2 (8)2xy2m2m1 (9) 1 x (10) 21mx3x22 1 6.约分: (1) (7) ; (8) (9); (10). ; (2) ; (3) ; (4) . (5); (6); 4x3y12x2y29xy37.先化简,再求值:,其中x=1,y=1 324x9xy 通分练习:1. 通分:(1) 2.通分:(1) yx14a3c5b,2,; (2)2,。 ,222x3y4xy5bc10ab2acx12x12x,,, (2); ,(2x4)26x3x2x24x21x23x22y2x31b;x2x1 (3)2,3.通分:(1)xy; (2) xyx14a2ac (4) 4.通分:(1) (4) 2 1112a1,, (5) ,2(ab)(bc)(bc)(ca)(ac)(ab)93aa9125yz3x3bc2a,,,,,; (2); (3)。 4232322x3y4z8xy3xyz6xz4a6ab3bc54yx11,,,; (5); (6); 2(x2)3(2x)2a(x2)b(x2)x(yx)2x2y 本文来源:https://www.wddqw.com/doc/21afb4d7971ea76e58fafab069dc5022aaea46d4.html