The minimum value of the function y=√(x2-2x+5)+√(x2+4) is ( ).(A)4.(B)3√2.(C)2√5.(D)√17.

题目

The minimum value of the function y=√(x2-2x+5)+√(x2+4) is ( ).

(A)4.

(B)3√2.

(C)2√5.

(D)√17.

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