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【OG20-P277-282题】if a and b are positive integers, is a/b <9/11 ?
(1) a/b <0.818
(2)b/a >1.223
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a/b<9/11≈0.81818……,b/a>11/9≈1.22222……
条件1:a/b<0.818<9/11,充分
条件2:b/a>1.223>11/9,充分
题目讨论 (2条评论)

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emily666
不管对错都是充分啊
2
0 回复 2020-05-10 19:50:23
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小火火火箭
9/11=0.8182,11/9=1.2222222
1
0 回复 2019-10-12 21:25:39