化简求值:(m-4)/(m^2-9)•{1+[(14m-7)/(m^2+8m+16)]}÷[1/(m-3) ] 其中m=5

问题描述:

化简求值:(m-4)/(m^2-9)•{1+[(14m-7)/(m^2+8m+16)]}÷[1/(m-3) ] 其中m=5

应该是(m²-8m+16)
(m-4)/(m^2-9)•{1+[(14m-7)/(m^2+8m+16)]}÷[1/(m-3) ]
=(m-4)/(m+3)(m-3)×(m²-8m+16+14m-7)/(m-4)²×(m-3)
=(m-4)/(m+3)×(m²+6m+9)/(m-4)²
=(m+3)/(m-4)
=(5+3)/(5-4)
=8;
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