解方程:x2+4xx−1+ 72x−72x2+4x−18=0
解方程:
+
−18=0
x2+4x |
x−1 |
72x−72 |
x2+4x |
数学人气:224 ℃时间:2020-04-03 12:46:22
优质解答
设y=x2+4xx−1,则原方程可化为y+72y−18=0y2-18y+72=0,所以y1=6或y2=12.当y=6时,x2+4xx−1=6, x2+4x=6x−6,故x2-2x+6=0.此方程无实数根.当y=12时,x2+4xx−1=12, x2+4x=12x−12,故x2-8x+12...
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