题目描述:
若函数f(x)在[a,b]上连续,a答案解析
【答案】证明:f(x)在[a,b]上连续,就在[c,d]上连续.因为(f(c)+f(d))/2在f(c),f(d)之间,由介值性定理,存在ξ∈[c,d],使得2f(ξ)=f(c)+f(d)
即:存在ξ∈(a,b),使得2f(ξ)=f(c)+f(d) 【其他答案】
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