数学题求解!先化简,再求值.
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数学题求解!先化简,再求值.
数学题求解!先化简,再求值.
数学题求解!先化简,再求值.
[3/(x-2)+2/(x+2)] ÷ [(5x²+2x)/(x²-4)]
=[3(x+2)+2(x-2)]/[(x-2)(x+2)] ÷ [x(5x+2)/(x²-4)]
=[(5x+2)/(x²-4)] ÷ [x(5x+2)/(x²-4)]
=1/x
因为x=√6/3
所以原式=3/√6=√6/2
原式=【3(x+2)+2(x-2)】/(x²-4)÷(5x²+2x)/(x²-4) =(5x+2)/(x²4)×(x²-4)/(5x²+2x) =1/x; 所以,原式=1(√6/3)√6/2