Question

Va rog sa ma ajutati cu exercitiile 18 19 20!!!

Answer 1

ti-am facut toate cele 3 exercitii
sper ca intelegi ^.^

Answer 2

Ex 18:
a)Adevarat
b)Adevarat
c)Fals
d)Fals
e)Adevarat
f) Fals

Ex:19

a) -94-17+42+(-70+81-1)= -79
1)-70+81=11
2)11-1=10
3)-94-17=-111
4)-111+42=-69
5)-69+10= -79

b) -6-[2+(-8)-1]=1
1)2+(-8)=-6
2)-6-1=-7
3)-6+7=1

c) 77-204+(245-475)-(41-242-156)= 0
1)245-475=-230
2)41-242=-201
3)-201-156=-357
4)77-204=-127
5)-127-230=-357
6)-357+357=0

d) 5-{2-[1-(-2)]}-6=0
1)1+2=3
2)2-3=-1
3)5+1=6
4)6-6=0

e) -400-[-245+(185-6100)]=5760
1)185-6100=-5915
2)-245-5915=-6160
3)-400+6160=5760

Ex 20:

a) x=4+(-10)-24-(-15)
x=4-10-24+15
x=-15 => opusul lui x =15

b) x=|-7|-|+3|+|-5+2|+(-11)
x=7-3+3-11
x=-4 => opusul lui x=4