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Ответ

Ответ дан
katrinaelisabethk1

Ответ: 400cm

Пошаговое объяснение: P=(a+b)•2

a=120

b=120-40=80

(120+80)•2= 400cm

Ответ

Ответ дан
alina33138

1) 120-40=80 (m) - ширина прямоугольника

2) 80+80+120+120=400 (m) - периметр прямоугольника

Ответ: 400m.

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