x2-14x+49 - (x-7)2, 25x2+10x+1 - (5x+1)2, 100x2+180xy+81y2 - (10x+9y)2, 64x2+80xy+25y2 - (8x+5y)2, 16x2-56xy+49y2 - (4x-7y)2, 4x2-4x+1 - (2x-1)2,

排行榜

視覺風格

選項

切換範本

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