Question

Cine poate sa imi faca si mie testul asta pls...Sau macar cateva exercitii..Dau fundita

Answer 1

1.
a)x-8#0 =>x#8
b)(-1+7)/(-1-8) = 6/(-9) = -2/3
2.
a)3x(x^2 + 2x)/3x(x^2 + 4x + 4) =
(3x^3 + 6x^2)/(3x^3 + 12x^2 + 12x)
b)x(x+2)/(x+2)^2 = x/(x+2)
3.
(x-1)/5x^3 + (x+1)/5x^3 = (x-1+x+1)/5x^3 = 2x/5x^3 = 2/5x^2
(x-1)/5x^3 - (x+1)/5x^3 = (x-1-x-1)/5x^3 = -2/5x^3
4.
4x/(x+3) • 6x^3/(x-3) = 24x^4/(x^2 - 9)
4x/(x+3) • (x-3)^2/36x^6 = (x-3)^2/9x^5(x+3)
5.
[3(1 - 2x^2) + 2x(3x - 1)]/12x^2 • 15x/(2x - 3) =
(3 - 6x^2 + 6x^2 - 2x)/4x • 5/(2x - 3) =
-(2x - 3)/4x • 5/(2x - 3) =
-5/4x
6.
a)[(x+2)/2x • (x^2 + x^2 + 2x)/(x+2)^2 - (x-2)/(x-3)] • (x+2) =
[(x+2)/2x • 2x(x+1)/(x+2)^2 - (x-2)/(x-3)] • (x+2) =
[(x+1)/(x+2) - (x-2)/(x-3)] • (x+2) =
[(x+1)(x-3) - (x-2)(x+2)]/(x+2)(x-3) • (x+2) =
(x^2 - 2x - 3 - x^2 + 4)/(x-3) =
(1 - 2x)/(x-3)
b)(1 + 2)/(-4) = -3/4