Предмет: Математика, автор: pavlutindenis2005

Площа прямокутника дорівнює 132 см2 , а його периметр - 46 см. Знайди сторони прямокутника.

Ответы

Автор ответа: ksen0283
1

Ответ:

Пошаговое объяснение:

Нехай ширина прямокутника х см, ширина - у см.

Складаємо систему:

\left \{ {{xy=132} \atop {(x+y)*2=46}} \right. \\

З другого рівняння знаходимо х+у=23, отже х=23-у і підставляємо у перше рівняння:

(23-у)*у=132

23у-y^{2}=132

y^{2} -23y+132=0\\D=(-23)^2-4*1*132=529-528=1\\\sqrt{D} =1\\y_{1} =12\\y_{2}=11

x1=23-12=11

x2=23-11=12

Отже, ширина=11см, довжина-12см

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