Ответ:
81d^2+81d–(81d+81d^2–81–81d)=81d^2+81d–81d–81d^2+81+81d=81+81d=81+81*12,5=81+1 012,5=1 093,5
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Ответ:
81d^2+81d–(81d+81d^2–81–81d)=81d^2+81d–81d–81d^2+81+81d=81+81d=81+81*12,5=81+1 012,5=1 093,5