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Raskolnikov1
@Raskolnikov1
July 2022
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Olya880
1
16+8x+x²²-68x-8-17x²²-2x=0
-16x²-62x+8=0
8x²²+31x-4=0
D=961+128=1089
x1=(-31-33)/16=-4
x2=(-31+33)/4=1/2
2
{2x²+xy=40
{3x-y=10
y=3x-10
2x²+x(3x-10)-40=0
2x²+3x²-10x-40=0
5x²-10x-40=0
x²-2x-8=0
x1=x2=2 u x18x2=-8
x1=-2 ⇒y1=3*(-2)-10=-16
x2=4⇒y2=3*4-10=2
(-2;-16);(4;2)
3
{-x+2y=9
{x²-2y=3
прибавим
x²-x=12
x²-x-12=0
x1+x2=1 U x1*x2=-12
x1=-3⇒y1=(9-3)/2=3
x2=4⇒y2=(9-4)/2=2,5
(-3;3);(4;2,5)
Olya880
Olya880
1)
=(4+x)*(12x+2)
4+x=12x+2
11x=2
x=
2) и 3) на фото
1 votes
Thanks 1
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Answers & Comments
16+8x+x²²-68x-8-17x²²-2x=0
-16x²-62x+8=0
8x²²+31x-4=0
D=961+128=1089
x1=(-31-33)/16=-4
x2=(-31+33)/4=1/2
2
{2x²+xy=40
{3x-y=10
y=3x-10
2x²+x(3x-10)-40=0
2x²+3x²-10x-40=0
5x²-10x-40=0
x²-2x-8=0
x1=x2=2 u x18x2=-8
x1=-2 ⇒y1=3*(-2)-10=-16
x2=4⇒y2=3*4-10=2
(-2;-16);(4;2)
3
{-x+2y=9
{x²-2y=3
прибавим
x²-x=12
x²-x-12=0
x1+x2=1 U x1*x2=-12
x1=-3⇒y1=(9-3)/2=3
x2=4⇒y2=(9-4)/2=2,5
(-3;3);(4;2,5)