Respuesta :
1. -2.5 + 5.2 = 3.3
12. 5/4 + (-7/4) = -2/4 = -1/2
13. 6/8 - 1/2 = 2/8 = 1/4
14. 1 1/2 x (3/-4) = 9/-4 = -2 1/4
12. 5/4 + (-7/4) = -2/4 = -1/2
13. 6/8 - 1/2 = 2/8 = 1/4
14. 1 1/2 x (3/-4) = 9/-4 = -2 1/4