Tính nhanh: 24.(16 – 5) –16. (24 - 5)

tính nhanh
b) 24. (16–5)–16. (24-5)
c) 29. (19–13)–19. (29–13)
d) 31. (-18) + 31. (-81)–31
e) (-12).47 + (-12). 52 + (-12)
f)13.(23 + 22)–3.(17 + 28)
g)-48 + 48. (-78) + 48.(-21)
h) 135. (171–123)–171. (135-123)