化简 (4/x^2-16)+(2/x+4)-(2/x-4)
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化简(4/x^2-16)+(2/x+4)-(2/x-4)化简(4/x^2-16)+(2/x+4)-(2/x-4)化简(4/x^2-16)+(2/x+4)-(2/x-4)解4/(x²-16)+
化简 (4/x^2-16)+(2/x+4)-(2/x-4)
化简 (4/x^2-16)+(2/x+4)-(2/x-4)
化简 (4/x^2-16)+(2/x+4)-(2/x-4)
解
4/(x²-16)+2/(x+4)-2/(x-4)
=4/(x-4)(x+4)+2(x-4)/(x-4)(x+4)-2(x+4)/(x+4)(x-4)
=4/(x-4)(x+4)+(2x-8)/(x-4)(x+4)-(2x+8)/(x+4)(x-4)
=(4+2x-8-2x-8)/(x-4)(x+4)
=-12/(x²-16)
12/16-x^2
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