解方程:(13x-x²)/(x+1)·[x+(13-x)/(x+1)]=42.

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解方程:(13x-x²)/(x+1)·[x+(13-x)/(x+1)]=42.
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解方程:(13x-x²)/(x+1)·[x+(13-x)/(x+1)]=42.
解方程:(13x-x²)/(x+1)·[x+(13-x)/(x+1)]=42.

解方程:(13x-x²)/(x+1)·[x+(13-x)/(x+1)]=42.