Question

giúp mk 3.23 nha

Answer 1

a. Với x = 7

(23 + x) - (56 - x)

= (23 + 7) - (56 - 7)

= 30 – 49

= - (49 – 30) = - 19

b. Với x = 13, y = 11

25 - x - (29 + y - 8)

= 25 - 13 - (29 + 11 - 8)

= 25 – 13 – 29 – 11 + 8

= (25 + 8) – (29 + 11 + 13)

= 33 – (40 + 13)

= 33 – 53

= - (53 – 33)

= -20

Answer 2

a)x = 7, ta có:

(23 + x) - (56 - x)

= (23 + 7) - (56 - 7)

= 30 - 49 = -19

 

b)  x = 13, y = 11, ta có:

25 - x - (29 + y - 8)

= 25 - 13 - (29 + 11 - 8)

 = 12 - 32 = -20.