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Dati factor comun in urmatoarele expresii a)5x·5y=5x(x-y) b7a+7b c 12·a+12·b+12·c d)12a-6b=6·(2a-b) e)2a+4a-5a f)15x+12y g)8a+12b+20c h)17x-17 Raspundeti in urmatorul mod a)5x-5y=5·(x-y) iar aici corect