a. (3x^2+7x+9):(x-1)

b. (-5x^5+2x^4-1/3x^3):(-1/2x^3)

c. (16x^2-9):(4x+3)

d. (5x^2-2x+1)(x-2)-3x(x+1)+7

e. (7x^3-2x^2):(-2x^2)+(5/4x^2-3x):x-1/2x(x-1)(2x+1)

Helppp!

`a. (3x^2+7x+9):(x-1)`

`=(3x^2+7x+9)(1/(x-1))`

`=(3x^2+7x+9)/(x-1)`

`b. (-5x^5+2x^4-1/3x^3):(-1/2x^3)`

`=(-5x^5+2x^4-(x^3)/3):(-(x^3)/2)`

`=(-5x^5.3)/3+(2x^4.3)/3-(x^3)/3):(x-(x^3)/2)`

`=-` `\frac{2(x-15x^2+6x-1)}{3}`

`c.(16x^2-9):(4x+3)`

`=(16x^2-9)(1/(4x+3) )`

`=(16x^2-9)/(4x+3)`

`=4x-3`

`d. (5x^2-2x+1)(x-2)-3x(x+1)+7`

`=(5.2x^2x+1)(x-2)-3x(x+1)+7`

`=(10x^(2+1)+1)(x-2)-3x(x+1)+7`

`=10x^4-20x^3-2x-3x^2+5`

`e. (7x^3-2x^2):(-2x^2)+(5/4x^2-3x):x-1/2x(x-1)(2x+1)`

`=(7x^3-2` `lần^2` `)(-1/(2 lần ^2 )` + `(((5x^2)/4-3x):1/2)x(x-1)(2` lần `+1)`

`=-(7x^3-2` `lần^2` `)1/(2 lần^2)+(((5x^2)/4-(3x.4)/4):1/2)x(x-1)(2 lần +1)`

`=(-7x+10x^5-29x^4+7x^3+12 lần^2 +2)/2`