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2x-4/x^2/x^2+3x除以x-2/x^2+6x+9 (a-5)乘以25-a^2/a^2-10a+25 a^2-4

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2x-4/x^2/x^2+3x除以x-2/x^2+6x+9 (a-5)乘以25-a^2/a^2-10a+25 a^2-4a+4/9a^2+6a+1除以6-3a/3a+1 请计算
2x-4/x^2/x^2+3x除以x-2/x^2+6x+9 (a-5)乘以25-a^2/a^2-10a+25 a^2-4
(1)2x-4/x^2/x^2+3x除以x-2/x^2+6x+9
=[2(x-2)(x+3)²]/[x(x+3)(x-2)]
=2(x+3)/x
=2+6/x
(2)(a-5)乘以25-a^2/a^2-10a+25
=[-(a-5)(a-5)(a+5)]/[(a-5)²]
=-(a+5)
(3)a^2-4a+4/9a^2+6a+1除以6-3a/3a+1
=[(a-2)²(3a+1)]/[-3(3a+1)²(a-2)]
=[(a-2)]/[-3(3a+1)]
=(2-a)/[3(3a+1)]