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For all integers a and b, the operation@is defined as a@b=(-a+b)(b+a). If a=2 an
For all integers a and b, the operation@is defined as a@b=(-a+b)(b+a). If a=2 an
游客
2024-01-13
68
管理
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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