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2.(5x+7y-4)(5x+7y-4)=25x²+35xy-20x +35yx+49y²-28y -20x-28y+16=
=25x²+49y²+70xy-40x -56y+16
3. 3^12+3^12+3^12+3^12+3^12+3^12=6*3^12
1/3*6*3^12=2*3^12