(3x3 +3x)÷(x2 +1)=(     )

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(3x3 +3x)÷(x2 +1)=(     )

(3x3 +3x)÷(x2 +1)=(     )
(3x3 +3x)÷(x2 +1)=(     )

(3x3 +3x)÷(x2 +1)=(     )
(3x3 +3x)÷(x2 +1)
=3x(x2 +1)÷(x2 +1)
=3x

(3x3 +3x)÷(x2 +1)
=3x(x2 +1)÷(x2 +1)
=3x

(3x3 +3x)÷(x2 +1)
=3x(x2 +1)÷(x2 +1)
=3x

(3x3 +3x)÷(x2 +1)
=3x(x2 +1)÷(x2 +1)
=3x