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... the second method at first, but they will understand it after reading the first few key steps. Only the third method is not very clear after reading it.
Teacher He rubbed his chin, glanced thoughtfully at the third problem-solving method, and said, "Your third method is the simplest, but it's a bit out of line."
Xiao Ran: "Well, I used the Olympiad to solve the problem."
Teacher He nodded and said, "Yes, let's go."
Xiao Ran put the chalk back, turned around and got o ...
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