Question

para sumar fracciones heterogeneas 3/4+5/9+45/13

Answer 1

ponemos parentesis:

(3/4 + 5/9) + 45/13

ahora resolvemos:

(3*9 + 4*5)/4*9  + 45/13

(27+ 20)/36  +45/13

47/36 + 45/13

47*13 + 36*45/ 36*13

611+ 1620/468

2231/468