[x-x/(x+1)]*[(x+1)/(x^2+3x+2)]÷[(x^2-2x)/(x^2-4)]一楼的纯粹是瞎扯
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[x-x/(x+1)]*[(x+1)/(x^2+3x+2)]÷[(x^2-2x)/(x^2-4)]一楼的纯粹是瞎扯[x-x/(x+1)]*[(x+1)/(x^2+3x+2)]÷[(x^2-2x)/(x
[x-x/(x+1)]*[(x+1)/(x^2+3x+2)]÷[(x^2-2x)/(x^2-4)]一楼的纯粹是瞎扯
[x-x/(x+1)]*[(x+1)/(x^2+3x+2)]÷[(x^2-2x)/(x^2-4)]
一楼的纯粹是瞎扯
[x-x/(x+1)]*[(x+1)/(x^2+3x+2)]÷[(x^2-2x)/(x^2-4)]一楼的纯粹是瞎扯
[x-x/(x+1)]*[(x+1)/(x^2+3x+2)]÷[(x^2-2x)/(x^2-4)]
=x²/(x+1)×(x+1)/(x+1)(x+2)×(x²-4)/(x²-2x²)
=x²/(x+1)×(x+1)/(x+1)(x+2)×(x-2)(x+2)/x(x-2)
=x/(x+1)
x/x+(1-x)/x-1/x
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分解因式----(X*X-X)(X*X-X-2)+1
X(X-1)=X
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x/x-1[1+(x-1/x)]
x-1/x÷(x-1/x)
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x+1/x-1
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