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alinka132
@alinka132
August 2022
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Решите методом подстановки систему уравнений (подробно!
2x^2 - y^2 = 14
3x + 2y = 5
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reghinka
2x^2 - y^2 = 14
3x + 2y = 5
2x^2 - y^2 = 14
2y = 5-3x
2x^2 - y^2 = 14
y = 5-3x/2
2x^2 - (5-3x/2)^2= 14
y = 5-3x/2
2x^2 - 25-30x+x^2/4= 14
y = 5-3x/2
8x^2 - 25-30x+x^2/4= 14
y = 5-3x/2
9x^2-30x-25=14*4
y=5-3x/2
9x^2-30x-25=56
y=5-3x/2
9x^2-30x-81=0
y=5-3x/2
3x^2-10x-27=0. discrimenant=25+81=106
y=5-3x/2. x1=5-10kornei iz 6/3
x2=5+10kornei iz 6/3
x1= 5-10kornei iz 6/3
y=5-15+30kornei iz 6/3= 30kornei iz 6/3-10
ili
x2=5+ 10kornei iz 6/3
y=5-15-30kornei iz 6/3=-10- 30kornei iz 6/3
2 votes
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Answers & Comments
3x + 2y = 5
2x^2 - y^2 = 14
2y = 5-3x
2x^2 - y^2 = 14
y = 5-3x/2
2x^2 - (5-3x/2)^2= 14
y = 5-3x/2
2x^2 - 25-30x+x^2/4= 14
y = 5-3x/2
8x^2 - 25-30x+x^2/4= 14
y = 5-3x/2
9x^2-30x-25=14*4
y=5-3x/2
9x^2-30x-25=56
y=5-3x/2
9x^2-30x-81=0
y=5-3x/2
3x^2-10x-27=0. discrimenant=25+81=106
y=5-3x/2. x1=5-10kornei iz 6/3
x2=5+10kornei iz 6/3
x1= 5-10kornei iz 6/3
y=5-15+30kornei iz 6/3= 30kornei iz 6/3-10
ili
x2=5+ 10kornei iz 6/3
y=5-15-30kornei iz 6/3=-10- 30kornei iz 6/3