👤
Hogeaiulia
a fost răspuns

Daca a(b+c+d)=-70 si ab+ad=+20 calculati a*c

Răspuns :

Alinsmarandach
a(b+c+d)=-70
ab+ac+ad=-70           
ab+ad+ac=-70
ab+ad=+20 
ac+20=-70
ac=-70-20=-90
ab+ad=20
a(b+c+d)=-70
ab+ac+ad=-70
20+ac=-70
ac=-70-20=-90

Alte intrebari