Lao Lu glanced at the math teacher's reaction and hurriedly asked, "What did she do, you are so shocked." ”

The math teacher carefully looked at the solution ideas on the draft before he took care of Lao Lu: "This is a high math question in college, and one question is still the finale of the secondary school test a few Mondays ago.

Because it is too difficult, many students throw the questions online to solve the problem after the exam. It was also because I had a friend who taught in No. 1 Middle School that I happened to see the question posted by her circle of friends. ”

When Lao Lu heard this, he hurriedly grabbed the draft book and studied it for a long time, and then asked the math teacher if he couldn't understand it, "Is what she did right or wrong?"

"Just the steps in the book......

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