先化简,再求值:m-3/3m²-6m÷(m+2-5/m-2),其中m是方程x²+3x-1=0的根
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先化简,再求值:m-3/3m²-6m÷(m+2-5/m-2),其中m是方程x²+3x-1=0的根
先化简,再求值:m-3/3m²-6m÷(m+2-5/m-2),其中m是方程x²+3x-1=0的根
先化简,再求值:m-3/3m²-6m÷(m+2-5/m-2),其中m是方程x²+3x-1=0的根
x=m
所以m²+3m-1=0
m²+3m=1
原式=(m-3)/3m(m-2)÷(m²-4-5)/(m-2)
=(m-3)/3m(m-2)×(m-2)/(m+3)(m-3)
=1/3m(m+3)
=1/3(m²+3m)
=1/3
m-3/3m²-6m÷(m+2-5/m-2)
=m-1/m²-6m/(m-5/m)
=m-1/m²-6m/[(m²-5)/m]
=m-1/m²-6m²/(m²-5)
化简的对吗?