2. 外语
  3. If A =(x-y)-z and B=x-(y-z), then A-B=

If A =(x-y)-z and B=x-(y-z), then A-B=

admin2013-05-19  20
问题 If A =(x-y)-z and B=x-(y-z), then A-B=
选项 A、-2z
B、-2y
C、0
D、2z
E、2y
答案A
解析 The correct answer is A. To solve this problem, first set it up:(x-y)-z-(x-(y-z)). Now simply perform the subtraction(pay attention to the negative signs!)to get -2z.
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