数学是教我们砍价的语文是教我们写情书的
[shù xué shì jiào wŏ men kăn jià de yŭ wén shì jiào wŏ men xiĕ qíng shū de]
This internet username uses a humorous exaggeration. It implies that although math teaches us to bargain and Chinese teaches us how to express romantic sentiments in letters, it is meant metaphorically, implying a desire for practical life skills.