请问这个二元三次方程组怎么算?
1个回答
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4x^3+4xy^2-4x=0 (1)
4y^3+4x^2.y-4y=0 (2)
(1)-(2)
(x^3-y^3) + xy(x-y) - (x-y) =0
(x-y)(x^2-xy+y^2 + xy -1 ) = 0
(x-y)(x^2+y^2-1) =0
x=y or x^2+y^2 =1
case 1: x=y
from (1)
4x^3+4xy^2-4x=0
4x^3+4x^3-4x=0
-4x=0
x=0
=> x=y=0
解集= { (0,0) or (x, ±√(1-x^2)) , x∈R}
4y^3+4x^2.y-4y=0 (2)
(1)-(2)
(x^3-y^3) + xy(x-y) - (x-y) =0
(x-y)(x^2-xy+y^2 + xy -1 ) = 0
(x-y)(x^2+y^2-1) =0
x=y or x^2+y^2 =1
case 1: x=y
from (1)
4x^3+4xy^2-4x=0
4x^3+4x^3-4x=0
-4x=0
x=0
=> x=y=0
解集= { (0,0) or (x, ±√(1-x^2)) , x∈R}
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