半迹题 10.0 万-|||-2.设 =dfrac ({x)^2+3x+2}(x) ,那么 y'=-|||-A .dfrac ({x)^2}(2)+3x+2ln 2-|||-B . -dfrac (2)({x)^2} .-|||-C 2x+3 ;-|||-D https:/img.cdnjtzy.com/zyb_c1dbf8c08bc60f33da6ea5a3d9039b64.jpg-dfrac (2)({x)^2}