225/150 = (45*5)/(30*5) * signifie multiplié par, / est la barre de division et 5/5 = 1 donc
225/150 = (45*5)/(30*5) = (9*5)/(6*5) = (3*3)/(2*3) = 3/2
378/270 = (189*2)/(135*2) = (42*9)/(30*9) = (14*3)/(10*3) = (7*2)/(5*2) = 7/5
1782/648 = (198*9)/(72*9) = (66*3)/(24*3) = (22*3)/(8*3) = (11*2)/(4*2) = 11/4
