Curs.21 - Lectia.4 - Multimea numerelor rationale

"The construction of sets of numbers that are establishing operations in these sets, properties of operations, constitutes the foundation of mathematics. Respecting If we teach mathematics chain: PRACTICE - THEORY - basically, the student will look at mathematics as a tool EC -I NEED IN LIFE. How about, online teacher does this? LOOK "
Professor John Bear in Bacau, Romania.