2. 外语
  3. For all integers a and b, the operation@is defined as a@b=(-a+b)(b+a). If a=2 and b=5, then b@a=

For all integers a and b, the operation@is defined as a@b=(-a+b)(b+a). If a=2 and b=5, then b@a=

admin2021-10-21  24
问题 For all integers a and b, the operation@is defined as a@b=(-a+b)(b+a). If a=2 and b=5, then b@a=
选项 A、25
B、-21
C、7
D、21
E、25
答案B
解析 5@2=(-5+2)(2+5)=-21
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