(3x的立方+3x)/(x的平方+1)等于多少?

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(3x的立方+3x)/(x的平方+1)等于多少?

(3x³+3x)/(x²+1)
=[3x(x²+1)]/(x²+1)
=3x

(3x^3+3x)/(x^2+1)
=3x(x^2+1)/(x^2+1)
=3x

3x

(3x^3+3x)/(x^2+1)=3x(x^2+1)/(x^2+1)=3x

3x