选择题
2017 AMC 8 Problem 21: Signs with Absolute Values
Suppose a, b, and c are nonzero real numbers and a + b + c = 0. What are the possible values of a/|a| + b/|b| + c/|c| + abc/|abc|?
2017年AMC 8 第21题 ：具有绝对值的标志
假设a、b和c是非零实数， a b c = 0。a/| a | b/| b | c/| c | abc/| abc |的可能值是什么？
A.
0
B.
1 and −1
C.
2 and −2
D.
0, 2, and −2
E.
0, 1, and −1