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中四數學

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臻臻仔

2007-12-13 22:17

# 1

3既2k+1次方=3既2k次方+6,咁k=幾多- -
唔該- -我要埋d式- -

mathjoe

2007-12-13 22:54

# 2

3^(2k+1) = 3^2k + 6
3(3^2k) = 3^2k + 6
2(3^2k) = 6
3^2k = 3
2k = 1
k = 1/2