Bonsoir, la simplification des racines carrées :
1/ √18 + √150 = √2x3² +√6x5² = √2 x √3² + √6 x √5² = 3√2 + 5√6
2/ √28-10√63+√175 = √2²x7-10√7x3²+√7x5² = 2√7-10x3√7+5√7 = -23√7
3/ (3√20 + 7)² =(3√20)² + 2x3√20x7 + 7² = 3√2²x5 + 42√2²x5 + 49 = 6√5 + 84√5+49
4/ 25x² - 49 = ( 5x + 7) (5x - 7 )
5/ 36x² - 12 + 1 = 6x² - 11
6/ (7x - 4) (2x + 3) + 3x ( 2x + 3) = 2 (2x+3) (5x -2)
Passe une excellente fin de journée :)