Question

Va rog ajutati-ma repede !!

8. Se stie ca a + b + c =23 si x = 9 , Calculati :

A) 14 * a + 14 * b + 14 * c + 14 * x =?

C) 349+6*a+6*b+6*c-12*x =?

E) 7*a+7*b+7*c-10*x =?




9. Calculati, folosind factorul comun:

a) 13*5+13*21+13*40 =

c)49*135-49*27+49*11 =

e)2 + 4 + 6 + 8 + 10 + 12 =

13. Calculati nr x, stiind ca a-b = 6 si :

a) x+3*a-3*b =

c) 7*a-7*b+7+x =


Va rog ajutor!

Answer 1

8.

A) dai factor comul 14

=14*(a+b+c+x)=14*(23+9)=14*32

C) =349+6*(a+b+c-2x)= 349-6*(23-18)=349-30=319

E) =7*(a+b+c)-10*x=7*23-10*9=161-90=71

9.

a) 13*(5+21+40)=13*66

c)=49*(135-27+11)=49*119

e)= 2*(1+2+3+4+5+6)=42

13. nu ai scris toata cerinta