400-1816-180
本題由lindy提供
In the rectangular coordinate system, are the points (r, s)
(1) r + s = 1
(2) u = 1 - r and v = 1 - s.
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.
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答案：
C
條件一當(dāng)中
只涉及到了r和s的情況，判斷不出，不充分
條件二，（r，s）和（1-r，1-s）只能說明兩個(gè)點(diǎn)的位置關(guān)系，但不能證明他們到原點(diǎn)的距離相等
聯(lián)立，可證兩個(gè)點(diǎn)為：（r，1-r）和（1-r，r），關(guān)于原點(diǎn)對(duì)稱，正確 
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