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(3) √(<4>a)=2√2×3×a
よって最小のaは6

5 力をのばそう
11≦10a+b≦66より、10a+bのとりうる値は16,25,36,49,64の5通り。
よって、a,bは6以下の正整数より、(a,b)=(1,6)(2,5)(3,6)(6,4)
4/36=1/9

ayaka

ありがとうございます!

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