初三数学,先化简,再求值
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[(a-3)/(2a-4) ]÷[5/(a-2)-a-2]
=[(a-3)/2(a-2)]÷[5/(a-2)-(a+2)]
=[(a-3)/2(a-2)]÷[5/(a-2)-(a+2)x(a-2)/(a-2)]
=[(a-3)/2(a-2)]÷[(5-aa+4)/(a-2)]
=[(a-3)/2(a-2)]x[(a-2)/(a+3)(3-a)]
=-1/[2(a+3)]
其中a=√3-3,
-1/[2(a+3)]==-1/[2√3]=-√3/6
=[(a-3)/2(a-2)]÷[5/(a-2)-(a+2)]
=[(a-3)/2(a-2)]÷[5/(a-2)-(a+2)x(a-2)/(a-2)]
=[(a-3)/2(a-2)]÷[(5-aa+4)/(a-2)]
=[(a-3)/2(a-2)]x[(a-2)/(a+3)(3-a)]
=-1/[2(a+3)]
其中a=√3-3,
-1/[2(a+3)]==-1/[2√3]=-√3/6
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