Giúp mình nhanh nhé, 60 điểm đó ạ

Đáp án+ Giải thích các bước giải:

`a, {3x}/{6y}`

`= {3x}/{3.2y}`
`= x/{2y}`
`{2x^2}/{8x^3}`
`= {2x^2}/{2x^2 . 4x}`
`= 1/{4x}`
`{5xy}/{10y}`
`= {5xy}/{5y.2}`
`= x/2`

_ _ _ _ _ _ _ _ _ _ _ _ _
`b, {x+2}/{x^2 -4}`

`= {x+2}/{(x+2)(x-2)}`
`= 1/{x-2}`

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

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _
`c, {2x+4}/{x+2}`
`= {2(x+2)}/{x+2}`
`= 2`

`{3x-6}/{x-2}`
`= {3(x-2)}/{x-2}`

`= 3`

`{x^2 -25}/{3x +15}`
`= {(x-5)(x+5)}/{3(x+5)}`
`= {x-5}/3`

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

`d, {3x^2 -3y^2}/{2x^2 +4xy +2y^2}`
`= {3(x^2 -y^2)}/{2(x^2 +2xy +y^2 )}`
`= {3(x-y)(x+y)}/{2(x+y)^2}`
`= {3(x-y)}/{2(x+y)}`
`{2x^2 -8x +8}/{x^3 -8}`
`= {2(x^2 -4x +4)}/{(x-2)(x^2 + 2x + 4)}`
`= {2(x-2)^2}/{(x-2)(x^2 +2x +4)}`
`= {2(x-2)}/{x^2 +2x +4}`