20/09/14 22:31:01.35 QeAeyuui.net
x^2/4+y^2/4+(1/2)xy sin135°
=(1/4)(x^2+y^2+√2)
=(1/4)(x^2+y^2-2xy cos135°)
=100/4
=25
20/09/14 22:31:01.35 QeAeyuui.net
x^2/4+y^2/4+(1/2)xy sin135°
=(1/4)(x^2+y^2+√2)
=(1/4)(x^2+y^2-2xy cos135°)
=100/4
=25
20/09/14 22:31:01.35 QeAeyuui.net
x^2/4+y^2/4+(1/2)xy sin135°
=(1/4)(x^2+y^2+√2)
=(1/4)(x^2+y^2-2xy cos135°)
=100/4
=25