手绘水平确实差劲啊,谅解.

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手绘水平确实差劲啊,谅解.手绘水平确实差劲啊,谅解.手绘水平确实差劲啊,谅解.[x-1-8/(x+1)]÷[(x^2+2x-3)/(x^3-x)]=[(x^2-9)/(x+1)]÷[(x+3)*(x-

手绘水平确实差劲啊,谅解.
手绘水平确实差劲啊,谅解.

手绘水平确实差劲啊,谅解.
[x-1-8/(x+1)]÷[(x^2+2x-3)/(x^3-x)]
=[(x^2-9) /(x+1)]÷[(x+3)*(x-1)/x*(x+1)*(x-1)]
=[(x+3)*(x-3) /(x+1)]*[x*(x+1)*(x-1)/(x+3)*(x-1)]
=x(x-3)
= x²-3x
因为x²-3x-1=0
所以,原式=1

[x-1-8/(x+1)]÷[(x²+2x-3)/(x3-x)]
=[(x²-9) /(x+1)]÷[(x+3)(x-1)/x(x+1)(x-1)]
=[(x+3)(x-3) /(x+1)]X[x(x+1)(x-1)/(x+3)(x-1)]
=x(x-3)
= x²-3x
=1 (x²-3x-1=0)

=【(x+1)(x-1)-8】/(x+1) × x(x²-1)/(x²+2x-3)
=(x+3)(x-3)/(x+1) × x(x+1)(x-1)/(x-1)(x+3)
=x(x-3)
=x²-3x
=1