问题
解答题
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答案
原式=
+3(a-1) (a+1)(a-1)
-6(a+1) (a+1)(a-1) 12 (a+1)(a-1)
=3(a-1)+6(a+1)-12 (a+1)(a-1)
=9(a-1) (a+1)(a-1)
=
．9 a+1
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原式=
+3(a-1) (a+1)(a-1)
-6(a+1) (a+1)(a-1) 12 (a+1)(a-1)
=3(a-1)+6(a+1)-12 (a+1)(a-1)
=9(a-1) (a+1)(a-1)
=
．9 a+1