Question

a. (7/8+4/5) - (9/20+-5/2)


b. (-3/2-4/5) + (7/3+5/2)


C. (-9/4x2/5) + (7/10x4/2)

es,operaciones con numeros racionales

Answer 1

El resultado de las operaciones son:

a. (7/8+4/5) - (9/20+-5/2)  =  149/40

b. (-3/2-4/5) + (7/3+5/2)  = 76/30 = 38/15

C. (-9/4x2/5) + (7/10x4/2) = 1/2

a. (7/8+4/5) - (9/20+-5/2)

= ((35+32)/40) -  (9/20-5/2)

= (67/40) - ((9-50)/20)

= (67/40) - (-41/20)

=67/40 + 41/20

= (67 +82) /40 = 149/40

b. (-3/2-4/5) + (7/3+5/2)

= (-15-8)/10 + (14+15)/6

= -23/10 + 29/6

= (-69+145)/30

= 76/30 = 38/15

C. (-9/4x2/5) + (7/10x4/2)

= (-18/20)+(28/20)

= (-18+28)/20

= 10/20 = 1/2