Shen Yi blushed at Ni Chenxi's words, "... I didn't listen to the class before, but now of course I can't understand it. Besides, if I understand, why do you want to..."

Ni Chenxi, who reacted, seemed to find that the sentence was a little heavy for a girl, but he never took the initiative to admit his mistake. He came forward and dragged the test paper with a straight face, "where didn't you understand?"

Shen Yi quickly took out a water-based pen and drew a circle on the test paper, "I don't understand these."

After painting, he looked at him with big watery eyes.

Ni Chenxi endured the "stupidity" at the mouth, took a look at Shen Yi, and finally accepted his life and moved a chair to sit on Shen Yi's right hand side, "then listen carefully to me. I'll only say these questions once."

After a pause, Ni Chenxi added: "if you don't understand and can't remember, you have to promise me a condition."

Shen Yi didn't care so much. Her desire to improve her grades was too strong, which directly made her selectively ignore the sentence behind Ni Chenxi, and only kept urging her: "hurry up."

Ni Chenxi looked at Shen Yi, who was anxious like a monkey, and smiled. The sample was so easy to be deceived.

Now that the words have been put on, Ni Chenxi is also in a good mood. It is rare to spend enough patience to help Shen Yi break the problem word by word, carefully list the problem-solving steps step by step, and then contact various formulas and theorems. He just wants to make Shen Yi dizzy. The more dizzy he is, the better he is.

Ni Chenxi thinks of everything very well. With Shen Yi's 60 points in mathematics and 90% in theory, even if there is a subject with almost full marks in English, it must be at the primary school level. It's very easy to dizzy her with these varied formulas and theorems.

But facts have proved that people are not as good as heaven. The ideal is very plump and the reality is very skinny. Ni Chenxi failed to start his career, and he lost his hand in the first problem of trigonometric function.

After listening to several questions, Shen Yi directly skipped the trigonometric function and turned back, "I can do these trigonometric function questions. You can teach me the solid geometry directly. I always use the wrong theorems and axioms and find the wrong relationship between edges and corners."

Ni Chenxi couldn't help but give her a white look, "... Why didn't you say it earlier."

Shen Yi smiled apologetically, "I'm just afraid I understand wrong, so let you tell me again and listen to your problem-solving ideas. Now I've determined the correctness of my thinking direction, and we can change the problem type."

Ni Chenxi held her breath and turned back. Without giving her a chance to breathe, she raised her hand and drew two auxiliary lines on the cuboid. "The key to this problem is to find the auxiliary line. As long as you draw the auxiliary line, all the edge and corner relations are clear at a glance. Then change to find the supplementary angle, and then find the tangent value of the supplementary angle."

Shen Yi looked at the auxiliary line that turned decay into magic and his eyes brightened. "It turns out that this problem can still be done. Why didn't the teacher draw the auxiliary line today?"

Ni Chenxi greatly enjoyed Shen Yi's fussy look, and one side of his eyebrows picked up contemptuously, "because the teacher only talked about the most conventional solution, and I said this method needs to draw two auxiliary lines, so it's hard for ordinary people to think of it."

After that, he looked at Shen Yi with a look of "you earned it." I've drawn the auxiliary line. Do you want to try to solve it yourself? "

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