求微分,x^3*(x+1)^-1,用quotient rule(商数规则?)

问题描述:

求微分,x^3*(x+1)^-1,用quotient rule(商数规则?)
RT...还有商数规则是什么-=-

若h(x)=u/v则h′(x)=(u′v-v′u)/v²令f(x)=x^3*(x+1)^-1则f′(x)=(3x²(x+1)-x³)/(x+1)²=(2x ³-3x²)/(x+1)² df(x)=(2x ³-3x²)/(x+1)²* dx