哈尔滨石油学院闹鬼:x/(x^2+4)的导数怎么求??
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(a/b)'=(a'*b-a*b')/(b)^2
x/(x^2+4)=[x'*(x^2+4)-(x^2+4)'*x]/[(x^2+4)^2]=[(x^2+4)-2x*x]/[(x^2+4)]^2=-(x^2-4)/[(x^2)+4]^2
x/(x^2+4)=[x'*(x^2+4)-(x^2+4)'*x]/[(x^2+4)^2]=[(x^2+4)-2x*x]/[(x^2+4)]^2=-(x^2-4)/[(x^2)+4]^2