如题所述
(1)(分子部分:子导母不导减去母导子不导,分母部分:即分母的平方)y'=3/(x+2)^2
(2)也可先分离常数: y=(X-1)/(X+2)
=(X+2-3)/(X+2)
=1-3/(X+2)
y'=3/(x+2)^2