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cho
nh6rn
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a.
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tim
bidu
di6n
cfia
nh6m
cludi
d?ng
ma
rr6n ZxZ
:
b.
Hry clua
bi{u
di6n
vd
clang
rdng
ftuc
tidp cria
cdc
bidu
di6n
ba't kh6
quy.
3.
X6t
phdn
tfr
gdnr
3 cip
nguy6n.tfi
kh6c
nhau.
PhAn
tir tr-Cn
r4o
thdnh
hinh
tdm
nrdt
(b6t
di6n)
vdi
c6c
tinh
cl6i
xfrng
sau:
quay
m6t
g6c
n
quanh
truc
x;
t*rc y;
rruc
z thi phf,'
tfr
kh6ng
thay
cldi
hirh
dang
<,_
-i
-
-
a.
Hry
chfrng
nrinh
rhng
cilc
ph6p
quay
tr'6n
tao
thinh
nh6rn
D2
b.
Hay
tirn
bidrr
di6n
gfia
nh6m
cltrdi
ctang
ma
tr{n:3
x
3
.
Thi
sirth
lcltittg
cltgc
sft tlqng
tdi liQu