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katyavolf2002
@katyavolf2002
August 2022
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Помогите плиииз,напишите решение)ответы внизу
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sangers1959
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X+2y=5 x=5-2y
2x²+3xy-5y²+7x+4y=3
2*(5-2y)²+3*(5-2y)*y-5y²+7(5-2y)+4y=3
50-40y+8y²+15y-6y²-5y²+35-14y+4y=3
-3y²-35y+82=0 |×(-1)
3y²+35y-82=0 D=2209
y₁=2 ⇒ x₁=5-2*2=1
y₁=-41/3=-13²/₃ ⇒ x₂=5-2*(-41/3)=97/3=32¹/₃.
Ответ: (1;2) (32¹/₃;-13²/₃) (в).
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Answers & Comments
Verified answer
X+2y=5 x=5-2y2x²+3xy-5y²+7x+4y=3
2*(5-2y)²+3*(5-2y)*y-5y²+7(5-2y)+4y=3
50-40y+8y²+15y-6y²-5y²+35-14y+4y=3
-3y²-35y+82=0 |×(-1)
3y²+35y-82=0 D=2209
y₁=2 ⇒ x₁=5-2*2=1
y₁=-41/3=-13²/₃ ⇒ x₂=5-2*(-41/3)=97/3=32¹/₃.
Ответ: (1;2) (32¹/₃;-13²/₃) (в).