根号2x-y+丨2y+4丨=0,则x²-2y的值为根号2x-y+丨2y+4丨=0,则x²-2y的结果为多少?2x-y在根号里,丨2y+4丨是绝对值
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![根号2x-y+丨2y+4丨=0,则x²-2y的值为根号2x-y+丨2y+4丨=0,则x²-2y的结果为多少?2x-y在根号里,丨2y+4丨是绝对值](/uploads/image/z/1989840-48-0.jpg?t=%E6%A0%B9%E5%8F%B72x-y%2B%E4%B8%A82y%2B4%E4%B8%A8%3D0%2C%E5%88%99x%26%23178%3B-2y%E7%9A%84%E5%80%BC%E4%B8%BA%E6%A0%B9%E5%8F%B72x-y%2B%E4%B8%A82y%2B4%E4%B8%A8%3D0%2C%E5%88%99x%26%23178%3B-2y%E7%9A%84%E7%BB%93%E6%9E%9C%E4%B8%BA%E5%A4%9A%E5%B0%91%3F2x-y%E5%9C%A8%E6%A0%B9%E5%8F%B7%E9%87%8C%2C%E4%B8%A82y%2B4%E4%B8%A8%E6%98%AF%E7%BB%9D%E5%AF%B9%E5%80%BC)
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根号2x-y+丨2y+4丨=0,则x²-2y的值为根号2x-y+丨2y+4丨=0,则x²-2y的结果为多少?2x-y在根号里,丨2y+4丨是绝对值
根号2x-y+丨2y+4丨=0,则x²-2y的值为
根号2x-y+丨2y+4丨=0,则x²-2y的结果为多少?
2x-y在根号里,丨2y+4丨是绝对值
根号2x-y+丨2y+4丨=0,则x²-2y的值为根号2x-y+丨2y+4丨=0,则x²-2y的结果为多少?2x-y在根号里,丨2y+4丨是绝对值
即
√2x-y+/2y+4/=0
∵√2x-y≥0
/2y+4/≥0
∴2x-y=0
2y+4=0
∴y=-2
∴x=-1
∴x²-2y
=1+4
=5