artpornbycraftyindividual Mental Calculation. In Public School of S. A. Rachinsky - Nikolay Bogdanov-Belsky (1895)View original on lemm.ee76Comments3Reply
aaberrate_junior_beatnik (he/him) midwest.socialI would never have guessed that result! What a weird coincidence.4Reply
Dem Bosain midwest.socialI'm sure there are lots of little coincidences like this. Taking x=10, the top of the fraction simplifies to: 5x^2^ + 20x +30 The rest of the solution is left as an exercise for the reader.3Reply
3 replies
Never seen this before. It’s incredible!
I would never have guessed that result! What a weird coincidence.
I'm sure there are lots of little coincidences like this.
Taking x=10, the top of the fraction simplifies to:
5x^2^ + 20x +30
The rest of the solution is left as an exercise for the reader.