丨3x+2y+3丨+(2x-4y-14)²=0,求x y的值.
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丨3x+2y+3丨+(2x-4y-14)²=0,求xy的值.丨3x+2y+3丨+(2x-4y-14)²=0,求xy的值.丨3x+2y+3丨+(2x-4y-14)²=0,求
丨3x+2y+3丨+(2x-4y-14)²=0,求x y的值.
丨3x+2y+3丨+(2x-4y-14)²=0,求x y的值.
丨3x+2y+3丨+(2x-4y-14)²=0,求x y的值.
因为丨3x+2y+3丨>=0,(2x-4y-14)²>=0,
而丨3x+2y+3丨+(2x-4y-14)²=0,
所以
丨3x+2y+3丨=0,(2x-4y-14)²=0,
3x+2y+3=0---(1)
2x-4y-14=0---(2)
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丨3x+2y+3丨+(2x-4y-14)²=0,求x y的值.
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