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OlyaVik
@OlyaVik
July 2022
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Pешите систему уравнений:
х² - у² = -21
х + у = -3
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krugly1981
Verified answer
X² - y² = - 21 x² - y² = - 21
x + y = - 3 x = - 3 - y
x² - y² = - 21 x + y = - 3
( - 3 - y)² - y² = - 21 x - 5 = - 3
9 - 2*(-3)*y + y² - y² = - 21 x = - 3 + 5
9 + 6y = - 21` x = 2
6y = - 21 - 9
6y = - 30
y = - 5
Ответ: ( 2, - 5) - решение системы.
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Answers & Comments
Verified answer
X² - y² = - 21 x² - y² = - 21x + y = - 3 x = - 3 - y
x² - y² = - 21 x + y = - 3
( - 3 - y)² - y² = - 21 x - 5 = - 3
9 - 2*(-3)*y + y² - y² = - 21 x = - 3 + 5
9 + 6y = - 21` x = 2
6y = - 21 - 9
6y = - 30
y = - 5
Ответ: ( 2, - 5) - решение системы.