Solve the big problem of seeking guidance in science mathematics in senior three?
When x->; - 1，3/x？ The limit ∞ of+1 1 >, ∴ 1/ax+ 1 is also ∞. If it is not ∞, the whole limit does not exist. So when x >:-1, ax+1->; 0,∴a= 1b=lim( 1/x+ 1-3/x？ + 1)=lim(x-2)/(x？ -x+ 1)=- 1