Предмет: Математика, автор: rasul700

Вычислите простым способом
Только a)

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Автор ответа: trscott

0

Ответ:

15600

Пошаговое объяснение:

139*18+139*21+261*21+261*18=139*(18+21) + 261*(21+18)= (139+261)(18+21)= 400*39=400(40-1)=16000-400=15600

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