已知5x2-3x-5=0,则5x2-2x-1/5x2-2x-5=

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已知5x2-3x-5=0,则5x2-2x-1/5x2-2x-5=已知5x2-3x-5=0,则5x2-2x-1/5x2-2x-5=已知5x2-3x-5=0,则5x2-2x-1/5x2-2x-5=28/5

已知5x2-3x-5=0,则5x2-2x-1/5x2-2x-5=
已知5x2-3x-5=0,则5x2-2x-1/5x2-2x-5=

已知5x2-3x-5=0,则5x2-2x-1/5x2-2x-5=
28/5
∵5X2-3X-5=0
∴5X2-2X-5=X
∴5x2-2x-1/5x2-2x-5=5X2-2X-1/X
又∵5X2-3X=5
∴5X-3=5/X
即X-3/5=1/X
带入右边式子,即;5X2-2X-(X-3/5)=5X2-3X+3/5
又∵5X2-3X=5
∴5x2-2x-1/5x2-2x-5=28/5