Question

Câu 8. (2,5 điểm): Thực hiện các phép tính:

a) $\left(6 x^8 y^2-27 x^8 y\right): 3 x y$.

b) $\left(2 x^2+16 x^8+3 x-4\right)$ : $(2 x-1)$.

c) $\dfrac{x^2}{x^2-4}+\dfrac{1}{x-2}+\dfrac{1}{x+2}$.

Answer 1

Answer 2

a,2x²y - 7x⁷

^{c,\(\dfrac{x}{x-2}\)}

Answer 3

a) (6x⁸y²-27x⁸y):3xy

=

Answer 4

a) 2x⁷y-9x⁷

c) x/ x-2

Answer 5

Answer 6

    

Answer 7

Answer 8

Answer 9

a)(6x⁸y² - 27x⁸y) : 3xy = 2x⁷y - 9x⁷

b)

  

c)

 

Answer 10

a) (6x^8y^2-27x^8y):3xy

=2x^2y-9x^7

b) (2x^2+16

Answer 11

Answer 12

Answer 13

a)(6x⁸y²-27x⁸y):3xy

= 2x⁷y-9x⁷

b)(2x²+16x³+3x-4):(2x-1)

= 8x²+5x+4

c)\(\dfrac{x^2}{\left(x-2\right)\left(x+2\right)}\)+\(\dfrac{x+2}{\left(x+2\right)\left(x-2\right)}+\dfrac{x-2}{\left(x+2\right)\left(x-2\right)}\)

=\(\dfrac{x^2+2x}{\left(x-2\right)\left(x+2\right)}\)

=\(\dfrac{x\left(x+2\right)}{\left(x+2\right)\left(x-2\right)}=\dfrac{x}{x-2}\)

 

Answer 14

Answer 15

    

Answer 16

Answer 17

  

Answer 18

  

Answer 19

  

Answer 20

a)6x^8y^2:3xy-27x^8y:3xy

=2y-9x^7

 

Answer 21

A)=3xy

B)= (2x-1)^2

X=2

Answer 22