已知X,Y为实数,且根号x-2+y²+6y+9=0,求2X-Y的值
人气:158 ℃ 时间:2019-08-19 01:55:25
解答
答:
实数x和y满足:
√(x-2)+y²+6y+9=0
√(x-2)+(y+3)²=0
所以:
x-2=0
y+3=0
解得:x=2,y=-3
所以:2x-y=4+3=7
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