令A,B,C是实数集合,f:A→B和g:A→B定义为,f (a)=a+1,g(b)=b2+2给出: (1)(f ◦g)(2) (2)(g ◦f)(2) (3)(f ◦g)(x) (4)(g ◦f)(x) (5)(f ◦f)(x) (6)(g ◦g)(x)
正确答案:
答案解析:有
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令A,B,C是实数集合,f:A→B和g:A→B定义为,f (a)=a+1,g(b)=b2+2给出: (1)(f ◦g)(2) (2)(g ◦f)(2) (3)(f ◦g)(x) (4)(g ◦f)(x) (5)(f ◦f)(x) (6)(g ◦g)(x)
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