分式计算1.(6/a^2-9)-(1/a-3)2.a+5-(5/5-a)3.x^2-4/x^2-4x+3*x-1/x^2+3x+2

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分式计算1.(6/a^2-9)-(1/a-3)2.a+5-(5/5-a)3.x^2-4/x^2-4x+3*x-1/x^2+3x+2

分式计算1.(6/a^2-9)-(1/a-3)2.a+5-(5/5-a)3.x^2-4/x^2-4x+3*x-1/x^2+3x+2
分式计算1.(6/a^2-9)-(1/a-3)
2.a+5-(5/5-a)
3.x^2-4/x^2-4x+3*x-1/x^2+3x+2

分式计算1.(6/a^2-9)-(1/a-3)2.a+5-(5/5-a)3.x^2-4/x^2-4x+3*x-1/x^2+3x+2
1.
6/(a²-9)-1/(a-3)
=6/(a²-9)-(a+3)/(a²-9)
=(6-a-3)/(a²-9)
=-1/(a+3)
2.
a+5-5/(5-a)
=a+5+5/(a-5)
=[(a+5)(a-5)+5]/(a-5)
=(a²-20)/(a-5)
3.
[(x²-4)/(x²-4x+3)]*[(x-1)/(x²+3x+2)]
=[(x+2)(x-2)/(x-1)(x-3)]*[(x-1)/(x+1)(x+2)]
=(x-2)/(x+1)(x-3)