Question

crush0718

想問這題怎麼算？感謝！

16.42 + (0.25) +2 之值為下列何者? (C).
17
(A)(B) 0 ()
17
(E)
6

高一數學1-1

Answer 1

呵

(0.25)^2=(1/4)^2=2^(-4)
2^(4)+2^(-4)+2
= [2^(2)]^2 +[2^(-2)]^2 +2×[2^(2)]×[2^(-2)]
=[2^(2)+2^(-2)]^2

開根號之後:4+1/4 = 17/4