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题目来源：
OG详解-OG3 数学2 Q8
正确答案：A
题目详解
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Choice A is correct. Since x is a factor of each term in the given expression, the expression is equivalent to x(9x)+ x(5), or x (9x +5).
Choice B is incorrect. This expression is equivalent to 45x2 +5x , not 9x2 +5x. Choice C is incorrect. This expression is equivalent to 9x2 + 45x , not 9x2 +5x. Choice D is incorrect. This expression is equivalent to 9x3 +5x2 , not 9x2 +5x.
Choice B is incorrect. This expression is equivalent to 45x2 +5x , not 9x2 +5x. Choice C is incorrect. This expression is equivalent to 9x2 + 45x , not 9x2 +5x. Choice D is incorrect. This expression is equivalent to 9x3 +5x2 , not 9x2 +5x.
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