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kuryaev04
@kuryaev04
July 2022
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x^2+7x-3b=0 x1^2+x2^2=37 найти b
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Answers & Comments
erzhan9210
Х1+х2=-7
х1*х2=-3b
(x1+x2)²=(-7)²
x1²+2x1x2+x2²=49
заменяем
37+2(-3b)=49
-6b=49-37
-6b=12
b=12/(-6)=-2
0 votes
Thanks 1
kuryaev04
спасибо большое! а можно ещё одно уравнение?)
erzhan9210
в вопросах увижу решу
kuryaev04
ок
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Answers & Comments
х1*х2=-3b
(x1+x2)²=(-7)²
x1²+2x1x2+x2²=49
заменяем
37+2(-3b)=49
-6b=49-37
-6b=12
b=12/(-6)=-2