(a2-a)a2-2a-3÷a(a-3)=a(a-1)(a+1)(a
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(a2-a)
a2-2a-3÷
a
(a-3)
=
a(a-1)
(a+1)(a-3)×
a-3
a
=
a-1
a+1
当a=
2+1时,
原式=
2
2+1+1=
2
2+2=
2-1.
故填空答案:
2-1.
a2-2a-3÷
a
(a-3)
=
a(a-1)
(a+1)(a-3)×
a-3
a
=
a-1
a+1
当a=
2+1时,
原式=
2
2+1+1=
2
2+2=
2-1.
故填空答案:
2-1.
(a2-a)a2-2a-3÷a(a-3)=a(a-1)(a+1)(a
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