问一道 GWD的数学谢谢战友解答

183077142 · 发表于 2011-1-26 16:51:54

Q29:
In the xy-plane, region R consists of all the points (x, y) such that 2x + 3y ≤ 6.Is the point (r, s) in region R ?
(1)3r + 2s = 6
(2)r ≤ 3 and s ≤ 2

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.

答案是E 可是我觉得2条件的两个点在R区域里啊

183077142 · 发表于 2011-1-26 16:56:06

Q32:

  Number Studying   Number Not   Total
  Biology   Studying Biology
Number         18
of Boys
Number
of Girls          8
Total   26

The table above shows the number of students in a certain high school class who are boys and the number of students in the class who are studying biology. What is the total number of students in the class?
(1)    Of the boys in the class, 15 are studying biology.
(2)   The number of girls in the class is twice the number of students in the class who are not studying biology.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.
Answer: B

为什么~~B 我的数学啊~~

gavensc · 发表于 2011-1-26 16:56:40

(2)给出的是一个rectangular的区域长是3 宽是 2

（1）是个三角形

183077142 · 发表于 2011-1-26 16:56:55

Number Studying   Number Not   Total
  Biology   Studying Biology
Number          18
of Boys
Number
of Girls
Total    26

表格应该是这样的

183077142 · 发表于 2011-1-26 16:59:57

明白了！！多谢！！加油！

问一道 GWD的数学谢谢战友解答

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