(x+3)(x+3) ,(2y+5)²,(b-7)², (6x²-5y)² ,(4x+5)(4x+5),51²-49²,(x+3)(x+7) ,103x104
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x2+6x+9, 4y2+20y+25 , b2-14b+49, 16x2+40x+25,200, x2+10x+21, 10712
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