1.当x____时,1/x+1有意义 化简:1.(3x/(x+2)-x/x-2)+2x/x²-4 2.(a/b
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1.当x____时,1/x+1有意义 化简:1.(3x/(x+2)-x/x-2)+2x/x²-4 2.(a/b-b/a)÷a+b/a
3.(x-1/(x+1)+2x/x²-1)÷1/x²-1
4.(2x-3/(x)-1)÷x²-9/x
3.(x-1/(x+1)+2x/x²-1)÷1/x²-1
4.(2x-3/(x)-1)÷x²-9/x
1、≠-1
1、3x(x-2)/(x²-4)-x(x+2)/(x²-4)+2x/(x²-4)
=(3x²-6x-x²-2x+2x)/(x²-4)
=(2x²-6x)/(x²-4)
2、(a²-b²)/ab×a/(a+b)
=(a-b)/b
3、=[(x-1)²+2x]/(x+1)(x-1)×(x²-1)
=x²+1
4、(2x-3-x)/x×x/(x+3)(x-3)
=(x-3)/x×x/(x+3)(x-3)
=1/(x+3)
1、3x(x-2)/(x²-4)-x(x+2)/(x²-4)+2x/(x²-4)
=(3x²-6x-x²-2x+2x)/(x²-4)
=(2x²-6x)/(x²-4)
2、(a²-b²)/ab×a/(a+b)
=(a-b)/b
3、=[(x-1)²+2x]/(x+1)(x-1)×(x²-1)
=x²+1
4、(2x-3-x)/x×x/(x+3)(x-3)
=(x-3)/x×x/(x+3)(x-3)
=1/(x+3)
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