TL:
a) (+23)+(-12)+5*2 = 23 - 12 + 10 = 21
b) (-5)+(-15)+8+(-8) = -5 - 15 + 8 - 8 = -20
c) 5-(4-7+12)+(4-7+12) = 5 - 4 + 7 - 12 + 4 - 7 - 12 = -19
d) -|-5+3-7|-| -5+7| = -9 - 2 = -11
e) 24-(72-13+24)-(72-13) = 24 - 72 + 13 - 24 -72 + 13 = -118
f) | 4-9-5|-(4-9-5)-15+9 = 10 + 10 - 15 + 9 = 14
g) -20-(25-11+8)+(25-8+20) = -20 - 25 + 11 - 8 + 25 - 8 + 20 = -5
h) (-20+10-3)-(-20+10)+27 = -20 + 10 -3 + 20 - 10 + 27 = 24
k) (14-12-7)-Dấu ngoặc vuông-(-3+2)+(5-9) = 14 - 12 - 7 -3 + 2 + 5 - 9 = -10
l) 14-23+(5-14)-(5-23)+17 = 14 - 23 + 5 - 14 -5 + 23 + 17 = 17