math problems

樓上嗰位大青計錯b part


a)log100(二進制) + log11001(二進制)
=log(2^2)+log(2^4+2^3+1)
=log4+log25
=log(4x25)
=2

b) log2.5 = k
consider log2.5+log0.4
= log(2.5x0.4)
= 0
k+log0.4 = 0
log0.4 = - k

2007-07-04 14:30:45 補充：
henryklau
正仆x照cop人啲嘢

1.
100(2逵制)=4(10進制)
11001(二進制)=16+8+1=25(10進制)
log100(二進制) + log11001(二進制)
=log4+log25
=log(4*25)
=log100
=2

2.
log2.5 = k
log(10/4) = k
log10 - log 4 = k
log4 = log10 - k

log0.4
= log 4^-1
= - log4
= k - log10

2007-07-03 00:35:31 補充：
超無奈..連我打錯字果度都一齊錯- -||重有就係你問題既(a)(b)我打左1.同2. 唔好意思^^"