12题至14题,

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12题至14题,12题至14题, 12题至14题,11.x≠-2且x≠312.(x²-30y)/(50x+6y²)13.9/514.xy/(x+y)

12题至14题,
12题至14题,
 

12题至14题,
11.x≠-2且x≠3
12.(x²-30y)/(50x+6y²)
13.9/5
14.xy/(x+y)