有冇數學勁人可以教下我數= =

-終場ソ使者-

2萬咁離譜-0-

基本上見到denominator有i,只要rationalization就得
eg.
i^-1=1/i=i/i²=-i

wong87

阿sir要我做果d 我差唔多冇題識 就咁沖入去問佢 我出來果陣己經成頭9血 (比人鬧到9血淋頭)

i^-6 = 1/ sqrt1 = 1= =?

唔係i^4=1咩= =

我想問解係乜-.-?
若2i是方程的解a^4+3a^2+b=0  求b 即係點?

-終場ソ使者-

i^-6
=1/i⁶
=1/[(i⁴)(i²)]
=1/[(1)(-1)]
=-1  喎

wong87

i-6
=1/i6
=1/[(i4)(i2)]
=1/[(1)(-1)]
=-1  喎
-終場ソ使者- 發表於 13-9-2009 09:53

打題-.-
係
i^-1 =  1/ sqrt1  =1 = =?


我想問解係乜-.-?
若2i是方程的解a^4+3a^2+b=0  求b 即係點?


1.log 3sqrt8/log100 64 即係log 3開方8 除 log 64 100為底
2.log3 4 - log3 6 / log12 6  log4 3為底 減 log6 3為底 除log6 12為底

3題=口=

-終場ソ使者-

你打得好亂-.-

[S]【YU】

log3 4 - log3 6 / log12 6
= (log3)4 - (log3)6/[(log3)6 /log(3)12]
= (log3)4 - log(3)12
= (log3)(1/3)
= -1

wong87

若2i是方程的解a^4+3a^2+b=0  求b
教下我=口=
高清版=口=

-終場ソ使者-

lg2/lg₁₀₀64
=lg2/(lg64/lg100)
=2lg2/6lg2
=1/3

wong87

e題識唔識=.=
若2i是方程的解a^4+3a^2+b=0  求b