7 клас. Формули скороченого множення. Спрощення виразів. Обчислення. Урок 6
Обчислити:
201*199; 74*66; 1,05*0,95; 111*129 92; 8^2-7^2 6^2-5^2 4^2-3^2 2^2-1^2;
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