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Liza81818191
Liza81818191
07.03.2023 01:57 •  Алгебра

Найдите прямоугольника равны 9 см и 16 см.
а)Найдите ширину прямоугольника,равновеликого данному,если его длина равна 18 см.​

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Ответ:
skymiss
skymiss
02.09.2022 12:11

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Must Waste More Time...

0,0(0 оценок)
Ответ:
YAN222
YAN222
09.09.2020 21:08
Просто предложено решить алгебраически систему двух уравнений.
1) х + у = 3 |*2      2х + 2у = 6
    3х -2у = -1        3х - 2у = -1 Сложим почленно: 5х = 5,⇒ х = 1
Теперь х =1 подставим в любое уравнение, например, в первое:
х + у = 3
1 + у = 3
у = 2
ответ:(1;2)
2) 7х +4у = 23 |*5          35x +20y = 115
    8х +10 у = 19|*(-2)    -16х -20у = -38  сложим почленно, получим:
19 у = 77 , ⇒ у= 77/19
Теперь у = 77/19 подставим в любое уравнение, например, в первое:
7х + 4у = 23
7х + 4*77/19 = 23
7х = 23 - 308/19=129/19
х = 129/133
ответ(129/133; 77/19) 
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