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,
问题描述：
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,
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/xa—b+c的相反数 = -(a—b+c) = -a+b-c = 4/3-3/4+1/x = 7/12 + 1/...