即|x|=|y|=|x+y-2|/√(1²+1²)若y=x则|x|=|2x-2|/√2平方2x²=4x²-8x+4x²-4x+2=0x=2±√2若y=-x则|x|=|x-x+2|/√2=√2所以x=2-√2,x=2+√2,x=√2,x=-√2
