【单选题】x 1 + x 2 + x 3 = a 1 (1) x 2 + x 3 + x 4 = a 2 (2) x 3 + x 4 + x 5 = a 3 (3) x 4 + x 5 + x 1 = a 4 (4) x 5 + x 1 + x 2 = a 5 (5) ,其中a 1 ,a 2 ,a 3 ,a 4 ,a 5 是常数,且a 1 >a 2 >a 3 >a 4 >a 5 ,则x 1 ,x 2 ,x ...
A.
x 1 >x 2 >x 3 >x 4 >x 5
B.
x 4 >x 2 >x 1 >x 3 >x 5
C.
x 3 >x 1 >x 4 >x 2 >x 5
D.
x 5 >x 3 >x 1 >x 4 >x 2