當m=-6分之1時,代數式m²;-9分之21-5m-m²;-9分之m除於m+3分之m-m+3分之m-3的值是

當m=-6分之1時,代數式m²;-9分之21-5m-m²;-9分之m除於m+3分之m-m+3分之m-3的值是

[(m²;-9)分之(21-5m)-(m²;-9)分之m]÷[(m+3)分之m -(m+3)分之(m-3)]
=[(m²;-9)分之(21-5m-m)]÷[(m+3)分之3]
=[(m²;-9)分之(21-6m)]×3分之(m+3)
=(m-3)分之(7-2m)
=-2 +(m-3)分之1
=-2 +(-6分之1 -3)分之1
=-2 -(6分之19)分之1
=-2 - 19分之6
=-2又19分之6