化简:1.(a+2-4/2-a)÷(a/a-2) 2.3/x-6/1-x-x+5/x²-x3.(a+2/a²-2a-a-1/a²-4a+4)÷4-a/a²-2a

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化简:1.(a+2-4/2-a)÷(a/a-2)2.3/x-6/1-x-x+5/x²-x3.(a+2/a²-2a-a-1/a²-4a+4)÷4-a/a²-2a化

化简:1.(a+2-4/2-a)÷(a/a-2) 2.3/x-6/1-x-x+5/x²-x3.(a+2/a²-2a-a-1/a²-4a+4)÷4-a/a²-2a
化简:1.(a+2-4/2-a)÷(a/a-2) 2.3/x-6/1-x-x+5/x²-x
3.(a+2/a²-2a-a-1/a²-4a+4)÷4-a/a²-2a

化简:1.(a+2-4/2-a)÷(a/a-2) 2.3/x-6/1-x-x+5/x²-x3.(a+2/a²-2a-a-1/a²-4a+4)÷4-a/a²-2a
1.(a+2-4/2-a)÷(a/a-2)
=(a²-4+4)/(a-2)×(a-2)/a
=a²/(a-2)×(a-2)/a
=a
2.3/x-6/1-x-x+5/x²-x
=3/x+6/(x-1)-(x+5)/x(x-1)
=(3x-3+6x-x-5)/x(x-1)
=8(x-1)/x(x-1)
=8/x
3.(a+2/a²-2a-a-1/a²-4a+4)÷4-a/a²-2a
=[(a+2)/a(a-2)-(a-1)/(a-2)²]×a(a-2)/[-(a-4)]
=[(a+2)(a-2)-a(a-1)]/a(a-2)² ×a(a-2)/[-(a-4)]
=-1/(a-2)