OG详解-OG1 数学2 Q11

Choice A is correct. Applying the distributive property, the given expression can be written as 7x³+7x -6x³+3x. Grouping like terms in this expression yields (7x³ -6x³ )+ (7x +3x). Combining like terms in this expression yields x³  +10x.
Choice B is incorrect and may result from conceptual or calculation errors.
Choice C is incorrect and may result from conceptual or calculation errors.
Choice D is incorrect and may result from conceptual or calculation errors.