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Is -3 ≤ X ≤ 3
(1)x2+y2=9
(2) x2+y≤9
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问x是否在【-3,3】的范围里面？
条件一：
化简得：
x^2=9-y^2（因为y^2大于等于0）
所以x^2小于等于9
x的取值范围在【-3,3】，充分。
条件二：
化简：x^2小于等于9+y，y未知，不充分（我虽然做对了，但在这个条件上有一丢丢纠结当时，不用纠结，就是y未知，可正可负可等于0，所以x^2很难说，只能说是最基本的大于等于0，但是上限是什么，未知，not sure，不充分。）
265694aviq
我真是眼瞎了...
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2021-12-08 16:00:24
徐子茜学员回复265694aviq
我也是。。。
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2022-10-11 21:21:30
旮旮
注意是y不是y2
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2021-10-27 20:37:37
Go800
条件1：y2>=0，所以x2<=9,也就是结论，充分。 条件2：y情况未知，所以无法对x进行判断。
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2021-02-15 22:31:33
听雪楼下堆雪人
第一个方程是圆
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2019-10-31 13:53:25
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数据充分DS
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