Question

va rog repedeeeeeeeeeee dau corona peste mine repedeee​

Answer 1

Răspuns:

8.

a*b+a*c+a=165

a(b+c)+a=165

a*10+a=165

11a=165

a=15

9.

a+b=20 =>3*a+3*b=3*20=>3a+3b=60 (1)

b+c=30=>4*b+4*c=4*30=>4a+4b=120 (2)

Adunam relatiile 1 si 2: 3a+3b+4b+4c=60+120 => 3a+7b+4c=180