staff有沒有複數?

staff有沒有複數?

沒有
動詞的過去式過去分詞哪些動詞雙寫?
舉幾個例子吧唉我英語都成這樣了~
若一個動詞中有一個母音字母,且最後一個字母是輔音字母,那麼雙寫那個輔音字母再加ed
如drop——dropped
若複數z·1-i/1+i=1+i/1-i,則複數Z=
若複數z乘以(1-i/1+i)=(1+i/1-i),則複數Z=
z·(1-i)/(1+i)=(1+i)/(1-i)
z =(1+i)^2/(1-i)^2
= 2i/(-2i)
= -1
馬的英語單詞怎樣拼寫
horse
英語動詞過去式錶
初一的
begin began
blow blew
buy bought
catch caught
choose chose
come came
do did
draw drew
drink drank
drive drove
eat ate
feel felt
find found
fly flew
forget forgot
get got
give gave
go went
grow grew
have/has had
hear heard
hurt hurt
keep kept
know knew
learn learned/learnt
leave left
let let
lie lay
make made
mean meant
meet met
put put
read read
ride rode
ring rang
run ran
say said
see saw
sing sang/sung
sit sat
sleep slept
speak spoke
spend spent
stand stood
sweep swept
swim swam
take took
teach taught
tell told
think thought
write wrote
真累人噠⊙﹏⊙b
書的最後一頁不是有啊
若複數z滿足(1+i)z=2-i,則│z+i│=
∵(1+i)z=2-i,∴(1+i)(1-i)z=(2-i)(1-i),∴(1-i^2)z=2-3i+i^2,
∴2z=1-3i,∴2z+2i=1-i,∴|2z+2i|=|1-i|=√〔1^2+(-1)^2〕=√2,
∴|z+i|=√2/2.
│z+i│=│0.5-1.5i+i│=│0.5-0.5i│=√2/2
寫出英語單詞,複數形式!
1 calf
2 horse
3 watch
4 sheep
5 hat
6 foot
7 toy
8 lion
9 joey
10 woman
11 baby
12 mouse
13 child
14 goose
15 skirt
16 pepople
17 box
18 class
19 knife
20 leaf
21 puppy
1 calf calves2 horse horses3 watch watches4 sheep sheep5 hat hats6 foot feet7 toy toys8 lion lions9 joey joeys10 woman women11 baby babies12 mouse mice13 child children14 goose geese15 skirt skirts16…
1.calves 2.horses 3.watches 4.sheep 5.hats 6.feet 7.toys 8.lions 9.joeys 10.women
11.babies 12.mice 13.shildren 14.geese 15.skirts 16.people 17.boxes 18.classes
19.knives 20.leaves 21.puppies
calf calves
horse horses
watch watches
sheep sheep
hat hats
foot feet
toy toys
lion lions
joey joeys
woman women
baby babies
…展開
calf calves
horse horses
watch watches
sheep sheep
hat hats
foot feet
toy toys
lion lions
joey joeys
woman women
baby babies
mouse mice
child children
goose geese
skirt skirts
pepople people
box boxes
class classes
knife knives
leaf leaves puppy puppies收起
baby的複數是把y變成i加es
誰能給我一張英語的動詞過去式不規則變化錶?
be was/were been(be動詞)
do did done(助動詞)
speak spoke spoken(講話)
read read read(閱讀)
cut cut cut(切)
cost cost cost(花費)
go went gone(去,走)
feel felt felt(感覺)
若複數z滿足arg(z+4)=π/6,則|z|的最小值
z+4=r(cosπ/6+isinπ/6)
z=(√3/2r-4)+ir/2
|z|²;=((√3/2r-4)²;+r²;/4
=r²;-4√3r+16
=(r-2√3)²;+4>=4
|z|>=2
最小值是2
【【【注:該題涉及到幅角主值,最好用“向量知識”。】】
可設向量z=(x,y),(x,y∈R)
又設向量a=(-4,0)
易知,z+4的意義,就是兩個向量z,與a的差。
即:z+4=z-a=(x,y)-(-4,0)=(x+4,y)
由arg(z+4)=π/6可知,點(x+4,y)在射線L上,
射線L的端點是原點,且…展開
【【【注:該題涉及到幅角主值,最好用“向量知識”。】】
可設向量z=(x,y),(x,y∈R)
又設向量a=(-4,0)
易知,z+4的意義,就是兩個向量z,與a的差。
即:z+4=z-a=(x,y)-(-4,0)=(x+4,y)
由arg(z+4)=π/6可知,點(x+4,y)在射線L上,
射線L的端點是原點,且與x軸的正方向夾角為30º;。
∴y/(x+4)=tan30º;=(√3)/3
∴(√3)y=x+4.===>3y²;=(x+4)²;
|z|²;=x²;+y²;=x²;+[(x+4)²;/3]
=(4x²;+8x+16)/3
=[(2x+2)²;+12]/3
=[(2x+2)²;/3]+4
即恒有:|z|²;=[(2x+2)²;/3]+4≥4
∴|z|≥2
∴最小值=2收起
連衣裙的複數英語單詞怎麼寫
dresses/skirts
dresses
dresses
dresses
連衣裙是:ONE-PIECE DRESS
所以他的複數,在dress後面加上es就好了
one-piece dresses