pls ex 4 si 5. pls pls pls pls pls pls pls pls pls pls pls pls pls

Răspuns:
stiu doar la 4 scz!!
4.
a) (7)-(9)=-2
b)|-7|+|-1|=
=7+1=
=8
II.
a)|x+7|=4
x=4-7
x=-3
|x|=3
b)x-5 mai mic sau egal -7
x={-5,-6,-7}
uite ca acm am rasp si la II
spor la scoala!!