关于X的方程x³-3x²+3x-9=0的实根有______个?
人气:435 ℃ 时间:2020-04-16 18:02:36
解答
1个我能知道怎么做的吗??May I know how you work it out ?原方程=x²(x-3)+3(x-3)=(x²+3)(x-3)=0,(x²+3)大于等于3,所以x=3
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