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设函数f(x)=(x2-10x+c1)(x2-10x+c2)(x2-10x+c3...
设函数f(x)=(x2-10x+c1)(x2-10x+c2)(x2-10x+c3)(x2-10x+c4)(x2-10x+c5),集合M={x|f(x)=0}={x1,x2,…,x9}⊆N*,设c1≥c2≥c3≥c4≥c5,则c1-c5为( )
A.20
B.18
C.16
D.14
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