Question

Calculati:
a)b+c,daca ab+ac-ad= -16 si a=d= -8
b)a+c,daca -bc-ab= -27 si b= -9
c)-b-c-d,daca ab+ac-ad= -24 si a= -4
d)a+d,daca ab+ac+cd+bd=36 si 3b+3c= -27
VA ROGGG!URGENTTT!

Answer 1

a)b+c,daca ab+ac-ad= -16 si a=d= -8
a(b+c-d)=-16
-8(b+c+8)=-16 /-8
b+c+8=2
b+c=2-8
b+c=-6
b)a+c,daca -bc-ab= -27 si b= -9
-bc-ab= -27 /-1
ab+bc=27
b(a+c)=27
-9(a+c)=27 /-9
a+c=-3
c)-b-c-d,daca ab+ac-ad= -24 si a= -4(!!!sigur nu ai ab+ac+ad=-24)
ab+ac-ad= -24 
a(b+c-d)=-24
-4(b+c-d)=-24 /-4
b+c-d=6 /-1
-b-c+d=-6(altfel nu se poate)

d)a+d,daca ab+ac+cd+bd=36 si 3b+3c= -27
3b+3c= -27/ 3
b+c=-9
ab+ac+cd+bd=36
a(b+c)+d(b+c)=36
(a+d)(b+c)=36
-9(b+c)=36 /-9
b+c=-4