已知a>1,解关于x的不等式2log以a为底(x-1)>log以a为底[1+a(x-2)]
问题描述:
已知a>1,解关于x的不等式2log以a为底(x-1)>log以a为底[1+a(x-2)]
答
2loga (x-1)>loga [1+a(x-2)]2loga (x-1)-loga [1+a(x-2)]>0loga (x-1)^2/[1+a(x-2)]>0=loga 1∵a>1∴(x-1)^2/[1+a(x-2)]>1[(x-1)^2-1-ax+2a]/[1+a(x-2)]>1[x^2-(2+a)x+2a]/(ax-2a+1)>0(x-2)(x-a)/(a...