2=log(a(1+b)) a^2=1+b
3=loga(5+b) a^3=5+b
a^3-a^2=4
a^3-a^2-4=0
(a^3-8)-(a^2-4)=0
(a-2)(a^2+2a+4)-(a-2)(a+2)=0
(a-2)(a^2+3a+6)=0 其中a^2+3a+6 >>0,;因为:deta=3^2-4*1*6
2=log(a(1+b)) a^2=1+b
3=loga(5+b) a^3=5+b
a^3-a^2=4
a^3-a^2-4=0
(a^3-8)-(a^2-4)=0
(a-2)(a^2+2a+4)-(a-2)(a+2)=0
(a-2)(a^2+3a+6)=0 其中a^2+3a+6 >>0,;因为:deta=3^2-4*1*6