(2+3^1/2)^x/2+(2-3^1/2)^x/2=4,求實數x=?
回答 (1)
2017-02-08 4:00 am
x/2 = 1 => x = 2
left = (2 + √3) + (2 - √3)
= 2 + 2
= 4
= right
answer = 2
left = (2 + √3) + (2 - √3)
= 2 + 2
= 4
= right
answer = 2
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