Shen Yi eagerly picked up his pen and began to immerse himself in thinking about the cuboid that changed with the addition of auxiliary lines.

Shen Yi has a good memory. After coming to this world for half a month, he can score more than 60 points in mathematics. Naturally, there will be no problem in understanding and thinking logic. Therefore, Shen Yi carefully looks for the relationship between lines, surfaces, edges and corners in the figure while screening various properties and judgment theorems that can be used in his mind.

This problem is too difficult, so Shen YILENG stared for five minutes to find out a clue, but mathematics is like this. As long as the way of thinking is right and the correct problem-solving method is adopted, everything will come naturally.

Because he taught her Ni Chenxi, Shen Yi checked it carefully before handing it to him with both hands.

Ni Chenxi also wants to find Shen Yi's loophole, but unfortunately, Shen Yi's question is really perfect. It proves that the process is simple and not redundant, and there are all the key parts.

In the end, Ni Chenxi can only calmly draw a tick for her.

Shen Yi smiled and took over as if he had found a treasure.

"We must remember the properties and judgment theorems of line, surface, vertical and parallel. After remembering, we should practice writing to make ourselves proficient, so that we can respond immediately when we see this type of topic."

Ni Chenxi turned over her math paper again. "I'll help you find a question bank for this type of question. I'll explain it to you after you practice."

"What about conic curves and equations? Do you want to talk about them?"

Shen Yi's chicken pecked the rice. "You have to talk. Tell me all the topics."

Ni Chenxi had a black face. "Where's the physicochemical student?"

Shen Yi pretended not to see Ni Chenxi's dissatisfied face, pondered carefully and said, "physics and chemistry need you to talk to me about special topics, but you don't have to be too detailed. You can help me pick out important knowledge points and error prone knowledge points to explain them. You don't have to worry about other pen practice."

"Then Biology..." Shen Yi pinched his sweaty palm. "Can I borrow your class notebook?"

Ni Chenxi was very satisfied with Shen Yi's weakness in front of him, but his face was still cold and could make ice residue, "why should I lend it to you?"

The excitement of solving the problem dissipated. Shen Yi couldn't help being blocked by this merciless words. After thinking carefully, he said: "... I owe you a personal favor."

Ni Chenxi despises her lack of consciousness. If she doesn't call me for dinner and owes me a favor, can't you help me with my English?

Ni Chenxi was proud and charming. She glanced at Shen Yi and couldn't help but curl her mouth. "Human feelings are too empty. I want to be real, or you'll help me with my English."

Then he looked down at Shen Yi with a "gift" look.

Shen Yi was stunned for a moment. When he understood it, he burst out laughing and said that human feelings were empty. In fact, even if he was embarrassed, he couldn't open his mouth.

Ni Chenxi was made weak by her sudden laughter. She always had a sense of embarrassment that her mind was exposed. "What are you laughing at? Don't laugh!"

Shen Yi also knew that he would stop when he was good. He stretched his lips and tried to restrain his smile.

Ni Chenxi is rare to be so weak in front of others. The lack of experience made him red ears all at once. He can only threaten with a straight face: "don't laugh, laugh again and I'll go."

"I don't laugh, I really don't laugh." Shen Yi covered his mouth with both hands and looked at him with big black and white eyes. "How do you want to speak English? Listening or vocabulary reading?"

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