Question

Ex 16,17,18 inmultirea si impartirea numerelor reale reprezentate prin litere​

Answer 1

Răspuns:

16.

a) -2x^2 + 3x + x^2 - 3x = -x^2

b) -2x^2 + 3x + 2x^2 + 10x = 13x

c) -5x^2 + 7x - 9 + 5x^2 = 7x - 9

d) -4x^3 + 6x^2 + 2x + 4x^3 = 6x^2 + 2x = 2x(3x + 1)

17.

a) 6x + (6x^3 + 10x^2 - 6x^3 + 12x^2) : ( -2x) =

6x - 11x = (-5x)

b) 3x - (8x^4 + 12x^3 - 3x^4 - 12x^3) : (-5x^3) =

3x + x = 4x

c) x^2 - x + (2x^4 + 4x^3 - x^4 - 4x^3) : x^3 =

x^2 - x + x = x^2

d) (x^3 + x^2 - 2x - x^2 + 2x) : x^2 + x^2 - x =

x + x^2 - x = x^2

18.

a) x^3 - x^2 + 3x + 2x^2 - 2x + 6 - x^3 - 2x^2 + 5x - x^2 - 2x + 5 =

-2x^2 + 4x + 11

b) 2x^3 - 4x^2 + 8x + x^2 - 2x + 4 - 2x^3 - x^2 - 3x + 6x^2 + 3x + 9 =

2x^2 + 6x + 13

c) x^3 - 3x^2 + 2x - 3x^2 + 6x - 6 - x^3 + 2x^2 - 3x - 3x^2 + 6x - 9 =

-7x^2 + 14x - 15

d) -2x^3 + 2x^2 - 4x + x^2 - x + 2 + 2x^3 - 2x^2 + 2x - 3x^2 + 3x - 3 =

-2x^2 - 1 = - (2x^2 + 1)