Question

log3(x+2)-log3(x方-x-6)+1>0答案和过程!

Answer 1

首先保证真数为正，有x+2>0且x²-x-6>0，联立解得

x>3

由log3(x+2)-log3(x²-x-6)+1>0变形得

log3(x+2)-log3[(x-3)(x+2)]>-1

log3{(x+2)/[(x-3)(x+2)]}> log3(1/3)

log3[1/(x-3)]> log3(1/3)

1/(x-3)>1/...