Ответ:
(-3;-1), (3;1), (-1;-3), (1;3)
Объяснение:
x²+y²=7+xy
(x²+y²)²=(7+xy)²
x⁴+2x²y²+y⁴=49+14xy+x²y²
x⁴+x²y²+y⁴=49+14xy
x⁴+x²y²+y⁴=91
14xy=42
xy=3
x= 3/y
9/y²-3+y²=7
пусть y²=t, t≥0
t²-10t+9=0
D=100-36= 64
t1= (10+8)/2= 9
t2= (10-8)/2= 1
y1= -1
y2= 1
y3= -3
y4= 3
x1= -3
x2= 3
x3= -1
x4= 1
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Verified answer
Ответ:
(-3;-1), (3;1), (-1;-3), (1;3)
Объяснение:
x²+y²=7+xy
(x²+y²)²=(7+xy)²
x⁴+2x²y²+y⁴=49+14xy+x²y²
x⁴+x²y²+y⁴=49+14xy
x⁴+x²y²+y⁴=91
14xy=42
xy=3
x= 3/y
9/y²-3+y²=7
пусть y²=t, t≥0
t²-10t+9=0
D=100-36= 64
t1= (10+8)/2= 9
t2= (10-8)/2= 1
y1= -1
y2= 1
y3= -3
y4= 3
x1= -3
x2= 3
x3= -1
x4= 1