题目内容
（1）a2 (x ?y) + b2 (y ?x) （2）x4 ? 18x2 + 81
(1) (x ?y) (a + b) (a ?b) (2) (x + 3)2 (x? 3)2
(1) 解：原式= a2(x?y)?b2(x ?y) =(x ?y) ( a2 ?b2) =(x ?y) (a + b) (a ?b)
(2) 解：原式= (x2? 9)2 = [(x + 3) (x? 3)]2 = (x + 3)2 (x? 3)2
(1) 解：原式= a2(x?y)?b2(x ?y) =(x ?y) ( a2 ?b2) =(x ?y) (a + b) (a ?b)
(2) 解：原式= (x2? 9)2 = [(x + 3) (x? 3)]2 = (x + 3)2 (x? 3)2
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