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Ответ

Ответ дан
Flora1912

Ответ:

Х = 0,8

Пошаговое объяснение:

а - длина  

в - ширина  

а*в - площадь  

(1,25*а) *(Х*в) = а*в  

значит 1,25*Х = 1  

Х = 1/1,25  

Х = 0,8  

т. е. ширину надо уменьшить на 1-0,8 = 0,2 либо на 20%

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