Question

determine o valor numerico de: a)5.(2×-3),para×=4. b)×-×,para×=-3. c)2×7+1,para×=14. d)2,8×+8,para×=-6.

Answer 1

a) 5.(2x-3)
    5.(2.4-3)

5.(8-3)=5.5=25

b) x-x

-3+3=0

d) 2,8x+8
     2,8.(-6)+8
     -16,8+8
      -8,8