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不等式两边同时乘以6,得2(2x-1)-6>=6x-3(5-3x)4x-2-6>=6x-15+9x11x<=7x<=7/11x-1<0x+3>0所以|x-1|-|x+3|=1-x-x-3=-2-2x所以-2x>=-14/11-2-2x>=-36/11|x-1|-|x+3|的最小值=-36/11|x-1|-|x+3|的最大值为正无穷...