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Is xy<6?
(1)x<3 and y<2
(2)1/2 < x < 2/3 and y2 <64
分析A选项
分析B选项
分析C选项
分析D选项
分析E选项
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其实很好解，条件 1 ：X = 2, Y = 1，XY = 2 < 6; X = -3, Y = -2 XY = 6; X = -4, Y = -2, XY = 8 > 6，不充分。条件 2，看似复杂，但比条件1还要简单，条件2 中 X = 正分数，且大于零、小于1，而Y大于 -8或小于8，无论如何 Y 的绝对值大于8，如果Y是正数，则Y最大值不超过8，而8乘以(1/2)或(2/3)均小于6，如果Y为负数，则无论值多大，XY的值均为负数，则均小于6.
371715hkenr
条件1忘记了考虑可能xy都是负数啊！
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2022-08-13 13:37:36
贾思敏
错题1反思：条件一：搞错了，直接将x和y相乘就说xy小于6，这样是错的。要运用取值代入法： 只说了x小于3，y小于2，可正可负，相乘就不一定小于6！！ ①若x=2，y=1，那么xy=2小于6 ②若x=-3，y=-2呢，那么xy=6 not sure，不充分
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2021-10-11 22:27:14
267301lvzcs
为什么选B呀？y=7，x=1，xy>6;y=5,x=1,xy<6不是不能确定吗。。。
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2020-10-19 22:36:42
387140ebit回复267301lvzcs
x<2/3，是三分之二，不是二分之三
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2020-11-12 13:12:26
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数据充分DS
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难题300
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点击上传数据充分DS -17964
Patricia purchased x meters of fencing. She originally intended to use all of the fencing to enclose a square region, but later decided to use all of the fencing to enclose a rectangular region with length y meters greater than its width. In square meters, what is the positive difference between the...
数据充分DS -17947
If S is the sum of the first n positive integers, what is the value of n?(1)S<20(2)>220
数据充分DS -17941
Is xy<6?(1)x<3 and y<2(2)1/2 < x < 2/3 and y2 <64
数据充分DS -17902
If 1< d <2 , is the tenths digit of decimal representation of d equal to 9 ?(1)d+0.01< 2(2)d+0.05>2
数据充分DS -17806
Is -3 ≤ X ≤ 3(1)x2+y2=9 (2) x2+y≤9
数据充分DS -17964
Patricia purchased x meters of fencing. She originally intended to use all of the fencing to enclose a square region, but later decided to use all of the fencing to enclose a rectangular region with length y meters greater than its width. In square meters, what is the positive difference between the...
数据充分DS -17947
If S is the sum of the first n positive integers, what is the value of n?(1)S<20(2)>220
数据充分DS -17941
Is xy<6?(1)x<3 and y<2(2)1/2 < x < 2/3 and y2 <64
数据充分DS -17902
If 1< d <2 , is the tenths digit of decimal representation of d equal to 9 ?(1)d+0.01< 2(2)d+0.05>2
数据充分DS -17806
Is -3 ≤ X ≤ 3(1)x2+y2=9 (2) x2+y≤9
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