设实数x,y满足x²+1/2y²4-xy+2y=0.则x=___,y=___
问题描述:
设实数x,y满足x²+1/2y²4-xy+2y=0.则x=___,y=___
答
你好
x²+1/2y²+4-xy+2y=0
x²-xy+1/4y²+1/4y²+2y+4=0
(x-1/2y)²+(1/2y+2)²=0
上式要成立,只有每一项都等于0,则
1/2y+2=0,解得y=-4
x-1/2y=0,x=1/2y=-2
设实数x,y满足x²+1/2y²4-xy+2y=0.则x=_-2__,y=_-4__
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答
即(x²-xy+1/4y²)+(1/4y²+2y+4)=0
(x-1/2y)²+(1/2y+2)²=0
所以x-1/2y=0
1/2y+2=0
所以
x=2
y=-4