原式=(m-3)/[3m(m-2)]·[﹙m+2﹚﹙m+2﹚-5]/﹙m-2﹚
=(m-3)/[3m(m-2)]·(m-2)/[﹙m+2﹚﹙m+2﹚-5]
=(m-3)/3m[﹙m²-4﹚-5]
=﹙m-3﹚/3m³-27m
=﹙m-3﹚/3m(m²-9)
=﹙m-3﹚/3m﹙m+3﹚﹙m-3﹚
=1/3m²+9m
因为m是方程x²+3x-1=0,则m²+3m-1=0即m²=1-3m带入原式得1/3-9m+9m=1/3
原式=(m-3)/[3m(m-2)]·[﹙m+2﹚﹙m+2﹚-5]/﹙m-2﹚
=(m-3)/[3m(m-2)]·(m-2)/[﹙m+2﹚﹙m+2﹚-5]
=(m-3)/3m[﹙m²-4﹚-5]
=﹙m-3﹚/3m³-27m
=﹙m-3﹚/3m(m²-9)
=﹙m-3﹚/3m﹙m+3﹚﹙m-3﹚
=1/3m²+9m
因为m是方程x²+3x-1=0,则m²+3m-1=0即m²=1-3m带入原式得1/3-9m+9m=1/3