问一些数学题 1.(a²/a-b)-a-b 2.[1-(2/x+1)]²÷(x-1/x+1)3.[(2ab/(a-b)(a-c)]+[2ac/(a-b)(c-a)]4.[(1/x-y+1/x+y)]÷(xy/x²-y²)

问一些数学题 1.(a²/a-b)-a-b 2.[1-(2/x+1)]²÷(x-1/x+1)3.[(2ab/(a-b)(a-c)]+[2ac/(a-b)(c-a)]4.[(1/x-y+1/x+y)]÷(xy/x²-y²)
问一些数学题 1.(a²/a-b)-a-b 2.[1-(2/x+1)]²÷(x-1/x+1)
3.[(2ab/(a-b)(a-c)]+[2ac/(a-b)(c-a)]
4.[(1/x-y+1/x+y)]÷(xy/x²-y²)

问一些数学题 1.(a²/a-b)-a-b 2.[1-(2/x+1)]²÷(x-1/x+1)3.[(2ab/(a-b)(a-c)]+[2ac/(a-b)(c-a)]4.[(1/x-y+1/x+y)]÷(xy/x²-y²)
参考答案：1：（2a-b）b/(a-b)
2:(x-1)/(x+1)
3:2a(b-c)/[(a-b)(a-c)]
4:(x-y)/xy/(x-y+1)

1、(a²/a-b)-a-b =a-b-a-b=-2b
2、[1-(2/x+1)]²÷(x-1/x+1)=[1-2/x-1]²÷(x-1/x+1)=(-2/x)²÷(x-1/x+1)=(2/x)²÷(x-1/x+1)=4/x²÷(x-1/x+1)= 4/x²÷(x-1/x+1)= 4/(x的三次方+x²-x)<...

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1、(a²/a-b)-a-b =a-b-a-b=-2b
2、[1-(2/x+1)]²÷(x-1/x+1)=[1-2/x-1]²÷(x-1/x+1)=(-2/x)²÷(x-1/x+1)=(2/x)²÷(x-1/x+1)=4/x²÷(x-1/x+1)= 4/x²÷(x-1/x+1)= 4/(x的三次方+x²-x)
3. [(2ab/(a-b)(a-c)]+[2ac/(a-b)(c-a)]=(2ab-2ac)/[(a-b)(a-c)]=2a(b-c)/[(a-b)(a-c)]
4. [(1/x-y+1/x+y)]÷(xy/x²-y²)= [1/(x-y)+1/(x+y)]÷[xy/(x²-y²)]=[1/(x-y)+1/(x+y)]X[(x²-y²)/xy]=[x+y+x-y/(x-y)(x+y)]X[(x²-y²)/xy]=[2x/(x²-y²)]X[(x²-y²)/xy]=2/y.

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