Question

va rog repedeee va rog dau coroana repedee!!!​

Answer 1

Explicație pas cu pas:

a) a×b+a×c=36/25

b+c=12

a×b + a×c = 36/25

a(b+c)=36/25

a×12=36/25

a=36/25 ÷ 12

a=36/25 × 1/12

a=3/25

b) a² + a×b + a×c = 2/3

a+b+c= -2

a² + a×b + a×c = 2/3

a(a+b+c)= 2/3

a× (-2) =2/3

a= 2/3 ÷ (-2)

a=2/3 × (-1/2)

a= -1/3

a+b+c= -2

-1/3 +b+c= -2

b+c= -2+ 1/3

b+c= -5/3

c) a²×b - a²×c = 9

b-c=4

a²×b - a²×c= 9

a²(b-c)=9

a²×4=9

a²=9÷4=9/4 =>

=> a= + 3/2