已知2丨3a+4丨+丨4b+3丨=—丨xc+1丨, - 知识问答

已知2丨3a+4丨+丨4b+3丨=—丨xc+1丨,求a—b+c的相反数的值快啊,

1个回答

∵丨xc+1丨≥0
∴—丨xc+1丨≤0
又：2丨3a+4丨≥0,丨4b+3丨≥0
∴2丨3a+4丨+丨4b+3丨=—丨xc+1丨=0
∴3a+4=0,4b+3=0,xc+1=0
∴a = -4/3,b = -3/4,c = -1/x
a—b+c的相反数 = -(a—b+c) = -a+b-c = 4/3-3/4+1/x = 7/12 + 1/x

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