????????????y=ax2+bx+c???a???b???c????????????a???0????????????????????? ??????b2-4ac=0?????????????????????????????????x????????? ??????a-b+c=0???????????????????????????-1???0?????? ??????a???0????????????????????????ax2+bx+c=0?????????x1???x2???x1???x2?????????ax2+bx+c???0????????????x1???x???x2??? ??????b=3a+
??????????????????______?????????????????????????????????????????? |
付费偷看金额在0.1-10元之间
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