CỘNG, TRỪ CÁC PHÂN THỨC SAU

Bài 15: Cộng, trừ các phân thức sau:

2

2x -15 15 - 6x

a/ ^{5x -1}

₂

+ ^{x +1}

₂

x - 6x + 9 + x - 6x + 9 ;

2

2

3x y 3x y ; b/ ⁷

₂

+ ¹¹

₃

12x y 18x y ; c/ ^x + ^{7x -16}

x + 2 (x + 2)(4x - 7) ; d/

x + 5

2

x - 5

e/

x(x +1) + x(x +1) ; f/ 4x -1 14x -1

₂

₂

5x y - 5x y ; g/ ^3x - ^{x - 6}

₂

2x + 6 2x + 6x ; h/ ^{x +1} - ^2x

₂

2x - 2 x -1 ;

3x

xy x

 ;

x + 8x 9 - 2x

 

7

4x

i/

x - y - y - x ; k/ ^x - ^x

x - 9 - 9 - x ; m/

2

2

2

2



5

5x + 5 10x -10 ; l/

x +1 x -1 2x - 2x

n/ ³ -

₂

⁴⁰ + ¹

+ -

3x - 2 3x + 2 4 - 9x ;

x - 3 x + 3 9 - x ; p/ ¹ - ⁴ - ^{3x - 6}

₂

2x + 5 4x - 25 2x - 5 ; o/

x x 2x

q/

- -

x - x x +1 x -1 ; r/ ¹ - ^2x - ^{x + 3}

₂

x +1 x -1 1- x ;