问题
解答题
已知：a=
|
答案
∵a=
=2-1 2+ 3
＜1，3
∴原式=
-(a+2)(a-3) a+2
=a-3+(a-1)2 a(a-1) 1 a
=2-
-3+2+3
=1．3
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已知：a=
|
∵a=
=2-1 2+ 3
＜1，3
∴原式=
-(a+2)(a-3) a+2
=a-3+(a-1)2 a(a-1) 1 a
=2-
-3+2+3
=1．3