⑴2x?2m?ax?am⑵x2?xy?a2x?a2y
⑶7m2?3n?mn?21m ⑷0.3ax?0.6ay?x?2y ⑸10mx?12nx?5my?6ny ⑹a3x2?a3y?x2?y
⑶x5y2?x3?3xy?3⑸a2?6ab?9b2?16x2y2 ⑹3m2?3?7m2y?7y ⑺13m?13m?m?1
⑻ab?cb?16a?16c
⑴?x?y??x?y⑵m2?m?1??n2?m?1? 3332323342
⑶a2?a?1??2a?a?1??a?1
⑹1?a21?b2?4ab
⑴ax?ay?2axy?ab⑵x?6xy?9y?4x?12y ⑶9a?18a?9?b?4b?4⑸?ax?by???ay?bx? 222????2222222
⑹a?ab?b
⑻x2?y2?a2
⑵m2?m?n??n2?n?m?⑶abx?y2224224??2?4x2y2 ?2??xy?a2?b2 ?⑷4m2n2?m2?n2?x2
⑺x2?2mx?m2?n2x2?2mx?m2n2
⑻?m?2n??2m2?8n2?8mn?1 4??2???2
3???⑴x?27x?1 4
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