(3) 25x2 +9y2
9y2 +64 + 30xy - 48y - 80x
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25x×2+9y2+64+30xy-48y-8x
50x+18y+64+30xy-48y-8x
50x-8x+18y-40y+64+30xy
42x-22y+64+30xy
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