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karicha2000
@karicha2000
July 2022
2
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8 класс. Алгебра. Периметр прямоугольника равен 9 м, а площадь — 5[tex]M^{2} [/tex] . Найдите его стороны.
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mmb1
Verified answer
P=2(a+b)=9
S=ab=5
a=9/2-b
b(9/2-b)=5
b(9-2b)=10
2b^2-9b+10=0
D=81-80=1
b=(9+-1)/4=2 5/2
стороны 2 и 2.5
2 votes
Thanks 1
karicha2000
Можете объяснить откуда в 3 строчке b ?
mmb1
2(ф+и)=9 a+b=9/2 a=9/2-b
karicha2000
Спасибо)
makoMustafaeva
Р= 2(а+в)=9
полупериметр=9/2=4.5
р=а+в=4.5
S=a*b=5
а=2 в=2.5
1 votes
Thanks 2
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Answers & Comments
Verified answer
P=2(a+b)=9S=ab=5
a=9/2-b
b(9/2-b)=5
b(9-2b)=10
2b^2-9b+10=0
D=81-80=1
b=(9+-1)/4=2 5/2
стороны 2 и 2.5
полупериметр=9/2=4.5
р=а+в=4.5
S=a*b=5
а=2 в=2.5