①4x^2-256=0 ②x^2-6x-10=9 ③-5x^2=4x-1
人气：484 ℃ 时间：2020-05-08 07:23:04
解答
1.x^2=64 x=8
2.x^2-6x-1=0 x=3或-2
3.-5x^2-4x+1=0 x=-1或x=1/5
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