分式的乘除
?7c?5abab3?5ab?9x10y3
?(1)2?;(2);(3);?2215ab?14c2cd4cd5yz?21x
ab3?5a3b3ab3?5a32a2xz3?5z23y???(4);(5); (6);???2c34cd?2c33c3c?2y33y?5z
2m2?2m?1m2?4m?41?m?2?2(7);(8)2;249?mm?7mm?2m?1m?4
3a?3b?25a2bx2?4y2x?2y?(9);(10);?32222210aba?bx?2xy?y2xy?2x
4x2?12xx2?10x?2522?(x?6x?9); (12)(x?25)?(11); 22?3x?5x2x?10x
x2?42x?6x2?5x?62x?6??2(13)2; (14); x?2x?32x?4x2?12x?2x
2x2?x?3x2?4x?53x2?7x?26x2?x?1?2?(15);(16);22x?22x?7x?154x?86?3x
x2?1x2?x2x?2x2?25y22x?10y10y??(17);(18)2;??2x?2x?1x?1x5xyx3x?15y
4x2?12x?91?x23x2?5x?2?(2?);(19)4?9x23x?5x?29?6x
x2?4xy?4y2x2?y22y?2x(20)?(?). 18y2?8x22x2?xy?3y22x2?xy?6y2
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