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Câu `13:`

`a) (2y-x^2)/(4xy) + (6y+x^2)/(4xy) \ (DKXD: x ne 0; y ne 0)`

`= (2y-x^2+6y+x^2)/(4xy)`

`= (8y)/(4xy)`

`= 2/x`

`b) (3x+10)/(x+2)-(x+6)/(x+2) \ (DKXD: x ne -2)`

`= ((3x+10)-(x+6))/(x+2)`

`= (3x+10-x-6)/(x+2)`

`= (2x+4)/(x+2)`

`= (2(x+2))/(x+2)`

`= 2`

Câu `14:`

`a)` Điều kiện xác định: `x-3 ne 0=>xne3`

`b)` 

`A=(x^2-6x+9)/(x-3)=(x-3)^2/(x-3)=((x-3)(x-3))/(x-3)=x-3`

Câu `15:`

`A=((x-2)/(x+2)+(6x-4)/(x^2-4)) . (x-2)/(x+1) \ (DKXD: x ne 2; x ne -1)`

`A=((x-2)/(x+2)+(6x-4)/((x-2)(x+2))) . (x-2)/(x+1)`

`A=((x-2)^2/((x+2)(x-2))+(6x-4)/((x-2)(x+2))) . (x-2)/(x+1)`

`A=(x^2-4x+4+6x-4)/((x-2)(x+2)) . (x-2)/(x+1)`

`A=(x^2+2x)/((x-2)(x+2)) . (x-2)/(x+1)`

`A=(x(x+2)(x-2))/((x-2)(x+2)(x+1))`

`A=x/(x+1)`

$\color{#29B6F6}{\heartsuit Phuongg \ Li nhh \heartsuit}$