Question

Dau coroana 1. A) -17+23+15-33+12 B) 76-105+24-8-7 C) -211 +101+110-25 D) 136-128-8-12+13



Si la ex 3: A) 101-[43-(11-8)+61] B) [-12-(17-15)+4] +10 C) -21+[+57-(-34+5-18)]+26 D)-14- {-41-[-17+8-(15-9)]+27} +13

Answer 1

Ex. 1

A) -17+23+15-33+12 = 6+15-21 = 21-21 = 0

B) 76-105+24-8-7 = -29+24-15 = -5-15 = -20

C) -211+101+110-25 = -110+110-25 = -25

D) 136-128-8-12+13 = 8-8+1 = 1

Ex. 2

A) 101-[43-(11-8)+61] = 101-[43-3+61] = 101-[40+61] = 101-101 = 0

B) [-12-(17-15)+4]+10 = [-12-2+4]+10 = [-12+2]+10 = -10+10 = 0

C) -21+[+57-(-34+5-18)]+26 = -21+[57-(-29-18)]+26 = 5+[57-47] = 5+10 = 15

D) -14-{-41-[-17+8-(15-9)]+27} +13 = -1-{-41-[-9-6]+27} = -1-{-14+15} = -1-1 = -2