Do you know what book the origin of mathematics is?

Yang Zhaolin looked at the simple steps she had sent and calculated it again.

Meng Fu's calculation ability was strong, and the entire process was in his mind. Yang zhaolin spent several times more time calculating.

At four in the morning, yang Zhaolin wrote down four pieces of paper and finally wrote down the positioning and accuracy of Meng Fu's main formulas.

There were dark circles under his eyes, but it confirmed Meng Fu's calculations.

Yang Zhaolin was overjoyed. Today was the deadline, and he didn't even eat. He took these papers and called Duan shenmin.

At four o 'clock, Duan shenmin was woken up by yang zhaolin's phone call. She heard yang zhaolin's excited voice."My younger cousin sister has calculated it!"