道,

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道,
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道,
道,
 

道,
13、[x/(x-3)]-2=m/(x-3) → [x-2(x-3)]/(x-3)=m/(x-3) → 6-x=m → x=6-m>0;所以 m<6;
14、[(a+b)/x]+(a/b)=-1 → (a+b)/x=-1-(a/b) → (a+b)/x=-(a+b)/b → x=-b;
15、[2/(x+2)]+(1/x)=4/(x²+2x) → (2x+x+2)/(x²+2x)=4/(x²+2x) → 3x+2=4 → x=2/3;

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