(1)a+c=√2+1
c/a=√2/2
c=√2a/2
√2a/2+a=√2+1
(√2+2)a/2=√2+1
a=2*(√2+1)/(√2+2)
=2*(√2+1)(√2-2)/(2-4)
=2*(2-2√2+√2-2)/(-2)
=-(-√2)
=√2
c=√2*√2/2
=1
b=√(2-1)
=1
x^2/2+y^2=1
(2)不存在.
(1)a+c=√2+1
c/a=√2/2
c=√2a/2
√2a/2+a=√2+1
(√2+2)a/2=√2+1
a=2*(√2+1)/(√2+2)
=2*(√2+1)(√2-2)/(2-4)
=2*(2-2√2+√2-2)/(-2)
=-(-√2)
=√2
c=√2*√2/2
=1
b=√(2-1)
=1
x^2/2+y^2=1
(2)不存在.