已知M是一元二次方程X^2+3X-1=0的实数根,那么代数式(M-3)/(3M^2-6M...
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发布时间:2024-10-20 01:33
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时间:2024-11-09 12:01
X^2+3X-1=0,M^2+3M=1
(M-3)/(3M^2-6M)/(M+2-5/((M-2))
=(M-3)/[3M(M-2)]/[(M^2-9)/(M-2)]
=(M-3)/[3M(M-2)]*[(M-2)/(M^2-9)]
=1/3M(M+3)
=1/3(M^2+3M)
=1/3