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Daniil2263
@Daniil2263
September 2021
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Помогите решить системы пожаалуйста!!!!!
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SanyaAD
Много заданий, решу только 2.
2x+y=4
2xy=3
y=4-2x
2x(4-2x)=3
8x-4x^2=3 (/-1)
4x^2-8x=-3
4x^2-8x+3=0
D=64-16*3=4
x1,2=8+-4/8=3/2 ; 1/2
y=4-2*3/2=4-3=1
y=4-2*1/2=4-1=3
x^2+y^2=9
x+y=3;
x=3-y;
9-6y+y^2+y^2=9
2y^2-6y=0
2y(y-3)=0
y=0 или y=3
x=3 или x=0
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Answers & Comments
2x+y=4
2xy=3
y=4-2x
2x(4-2x)=3
8x-4x^2=3 (/-1)
4x^2-8x=-3
4x^2-8x+3=0
D=64-16*3=4
x1,2=8+-4/8=3/2 ; 1/2
y=4-2*3/2=4-3=1
y=4-2*1/2=4-1=3
x^2+y^2=9
x+y=3;
x=3-y;
9-6y+y^2+y^2=9
2y^2-6y=0
2y(y-3)=0
y=0 или y=3
x=3 или x=0