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anastay2к18
@anastay2к18
July 2022
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Помогите по геометрии
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BETTELGEUSE
Задание 1.
АВ=12.
CD=13. Центр точка O.
DO=x=9. CO=y=13-9=4.
AO=a. BO=b.
Formula: x•y=a•b.
4•9=k(12-k). ☞ k²-12x+36=0.
(k-6)²=0. ☞ k=6.
Задание 2.
AD=DE=3. AB:AC=1:2.
AB=x=k. AC=y=2k. AD=a=3. DE=b=3.
Formula: x(x+y)=a(a+b).
k(k+k)=3(3+3).
2k²=18. k=BC=3.
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Answers & Comments
АВ=12.
CD=13. Центр точка O.
DO=x=9. CO=y=13-9=4.
AO=a. BO=b.
Formula: x•y=a•b.
4•9=k(12-k). ☞ k²-12x+36=0.
(k-6)²=0. ☞ k=6.
Задание 2.
AD=DE=3. AB:AC=1:2.
AB=x=k. AC=y=2k. AD=a=3. DE=b=3.
Formula: x(x+y)=a(a+b).
k(k+k)=3(3+3).
2k²=18. k=BC=3.