fracciones Online version matemáticas by Alonso Loera 1 5/9+7/5= 2 3/5-7/3= 3 9/5*7/8= 88/45 1 entero 43/45 176/90 -26/15 -1 entero -11/15 -52/30 63/40 1 entero 23/40 126/80