3/(x-4)-24/x平方-16化简,
问题描述:
3/(x-4)-24/x平方-16化简,
答
3/(x-4)-24/(x^2-16)
={3(x+4)-24}/(x-4)(x+4)
=(3x-12)/(x-4)(x+4)
=3(x-4)/(x-4)(x+4)
=3/(x+4)