计算:1/2lg(2x+2更号(x方-1)+lg(更号(x+1)-更号(x-1))(x>1)
问题描述:
计算:1/2lg(2x+2更号(x方-1)+lg(更号(x+1)-更号(x-1))(x>1)
答
1/2lg(2x+2更号(x方-1)+lg(更号(x+1)-更号(x-1))(x>1)=1/2lg[2x+2√(x^2-1)]+lg[√(x+1)-√(x-1)]=1/2lg[(x+1)+2√(x^2-1)+(x-1)]+lg{2/[√(x+1)+√(x-1)]}=1/2lg{[√(x+1)+√(x-1)]^2}+lg{2/[√...