1,解方程：x方-2x-1=0 2,先化简在求值,(1+x-3/x+3)除以2x/x方-9,其中x=根号3+3
问题描述：
1,解方程：x方-2x-1=0 2,先化简在求值,(1+x-3/x+3)除以2x/x方-9,其中x=根号3+3
答
解1：x²-2x-1=0x²-2x=1x²-2x+1=2(x-1)²=2x-1=±√2x-1=√2或x-1=-√2x1=1+√2x2=1-√2解2：原式=[1+(x-3)/(x+3)]÷[2x/(x²-9)]=[2x/(x+3)]÷[2x/(x+3)(x-3)]=[2x/(x+3)]×[(x+3)(x-3)/2x]=...