(9x²-81)÷(3x-9)

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(9x²-81)÷(3x-9)

(9x²-81)÷(3x-9)
(9x²-81)÷(3x-9)

(9x²-81)÷(3x-9)
9x²-81)÷(3x-9)=3x+9

(9x²-81)÷(3x-9)
=(3x-9)(3x+9)÷(3x-9)
=3x+9

(9x²-81)÷(3x-9)
=(3x-9)(3x+9)÷(3x-9)
=3x+9

这个和容易呀!(9x²-81)÷(3x-9)
=9(x²-9)÷3(x-3)
=9(x-3)(x+3)÷3(x-3)
=3(x+3)

=9(x²-9)/(3(x-3))=3(x+3)
平方差公式:(a+b)(a-b)=a^2-b^2