Question

Ajutor! Ex. 19 , punctele insemnate, va rog frumos!

Answer 1

19) c) - {-48:[(-25+7-18):(-11+8)]}+15:(-5)=-[-48:(-36:(-3))]-3=-(-48:12)-3
-(-4)-3=4-3=1

D)-[8x(-1)+6]-(-4)=-(8x5)+4=-40+4= - 36

E)[46-(13+6:3)x3]x5=(46-15x3)x5=(46-45)x5=1x5=5

F)[(-45-45+90):1996]x25=0:1996x25=0x25=0

Answer 2

c)-{48[(25+7-18):(11+8)]}+15:(-5)=-[-48:(14:19)]-3=$-(-48 : \frac{19}{14} )-3$=-(-48×$\frac{19}{14}$)-3=$-48($×$\frac{19}{7} )-3$=$-(-\frac{456}{7} )-3$=$\frac{456}{7} -3$=$\frac{453}{7}$
d)-{8[(-573)-(-572)]-2×(-3)}-(6-10)=-[8(-573+572)+6]-(-4)=-[8(-10)+6]+4=-(-8+6)+4=-(-2)+4=2+4=6
e){46-[26:2+(18-6×2):(4×2-5)]×3}×(15-10)={46-[13+18-12):(8-5)]×3)×5=[46-(13+6:3)×3]×5=[46-(13+2)×3]×5=(46-15×3)×5=(46-45)×5=1×5=5
f){[4500:(-100)-90:2-(-90)]:1996}×25=[(-45-45+90):1996]×25=(0:1996)×25=0×25=0