(9a²-b²)÷(3a+b)=?

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(9a²-b²)÷(3a+b)=?
(9a²-b²)÷(3a+b)=?

(9a²-b²)÷(3a+b)=?
(9a²-b²)÷(3a+b)
=(3a-b)(3a+b)÷(3a+b)
=3a-b

3a-b

3a-b

(9a²-b²)÷(3a+b)
=(3a+b)(3a-b)÷(3a+b)
=(3a-b)

原式=3a-b