OG详解-OG3 数学2 Q5

Choice B is correct. Combining like terms inside the parentheses of the given expression, 20w - (4w + 3w), yields 20w - (7w). Combining like terms in this resulting expression yields 13w .
Choice A 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.