
初中数学,求解!!!
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解:原式=[(x+2)(x-2)/(x-2)^2-(x-2)/(x+2)]*(x-2)/x
=[(x+2)/(x-2)-(x-2)/(x+2)]*(x-2)/x
=[[(x+2)^2-(x-2)^2]/(x+2)(x-2)]*(x-2)/x
=[8x/(x+2)(x-2)]*(x-2)/x
=8/(x+2)
将x=√2-2代入,原式即得=8/√2=4√2
=[(x+2)/(x-2)-(x-2)/(x+2)]*(x-2)/x
=[[(x+2)^2-(x-2)^2]/(x+2)(x-2)]*(x-2)/x
=[8x/(x+2)(x-2)]*(x-2)/x
=8/(x+2)
将x=√2-2代入,原式即得=8/√2=4√2
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