已知丨x+1丨+(y+2)²+丨z-1丨=0,求(x+y)²-(y+z)²-(z+x)²

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已知丨x+1丨+(y+2)²+丨z-1丨=0,求(x+y)²-(y+z)²-(z+x)²已知丨x+1丨+(y+2)²+丨z-1丨=0,求(x+y)&#

已知丨x+1丨+(y+2)²+丨z-1丨=0,求(x+y)²-(y+z)²-(z+x)²
已知丨x+1丨+(y+2)²+丨z-1丨=0,求(x+y)²-(y+z)²-(z+x)²

已知丨x+1丨+(y+2)²+丨z-1丨=0,求(x+y)²-(y+z)²-(z+x)²
丨x+1丨+(y+2)²+丨z-1丨=0,

丨x+1丨=0,x=-1
(y+2)²=0,y=-2
丨z-1丨=0,z=1
求(x+y)²-(y+z)²-(z+x)²=9-1-0=8

8 x=-1,y=-2,z=1