已知3xx-4x+6=o求xx-3x+4+2xx-x+8
1个回答
3xx-4x=-6
求xx-3x+4+2xx-x+8
=3xx-4x+12
=-6+12
=6
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已知xx+3x-1=0,求xx+1/xx+2x-2/x的值.