Tin một số tự nhiên có 4 chữ số, biết rằng nếu ta xóa đi chữ số hàng chục và hàng đơn vịthi ta được số nhỏ hơn số đó 3663 đơn vị.
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Tin một số tự nhiên có 4 chữ số, biết rằng nếu ta xóa đi chữ số hàng chục và hàng đơn vị thì ta được số nhỏ hơn số đó 1983 đơn vị
nếu ta xóa đi chữ số hàng chục và hàng đơn vị của số đó đi thì số đó giảm đi 100 lần và giá trị của số hàng chục và hàng đơn vị ghép lại
Vậy giá trị đó là : 1983 : (100 - 1 ) = 20 dư 3
Vậy giá trị của số hàng chục và hàng đơn vị ghép lại là 03
Số đó là : (1983 - 3 ) : 99 x 100 + 3 =2003
Đáp số : 2003
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Bài 1: Khi viết thêm chữ số 0 xen giữa chữ số hàng chục và hàng trăm của một số tự nhiên có ba chữ số thì số đó gấp lên 7 lần. Tìm số có ba chữ số đó.Bài 2 : Cho số tự nhiên có 4 chữ số. Nếu ta xóa đi chữ số hàng chục và hàng đơn vị của số đó thì số đó giảm đi 4455 đơn vị. Tìm số đó.Bài 3 : Tìm số có 4 chữ số, biết rằng nếu xóa đi chữ số hàng chục và hàng đơn vị thì ta được số nhỏ hơn số đó 3663 đơn vị.
Đọc tiếp
Bài 1: Khi viết thêm chữ số 0 xen giữa chữ số hàng chục và hàng trăm của một số tự nhiên có ba chữ số thì số đó gấp lên 7 lần. Tìm số có ba chữ số đó.
Bài 2 : Cho số tự nhiên có 4 chữ số. Nếu ta xóa đi chữ số hàng chục và hàng đơn vị của số đó thì số đó giảm đi 4455 đơn vị. Tìm số đó.
Bài 3 : Tìm số có 4 chữ số, biết rằng nếu xóa đi chữ số hàng chục và hàng đơn vị thì ta được số nhỏ hơn số đó 3663 đơn vị.
Bài 1
a0b = ab x 7
a x 100 + b = ( a x 10 + b ) x7
a x 100 + b = a x 10 x 7 + b x 7
Cùng bớt đi b
a x 100 = a x 70 + b x 6
Cùng bớt đi a x 70
a x 30 = b x 6
Cùng chia cho 6
a x 5 = b x 1
=>a = 1 ; b = 5
Vậy số đó là 15
2 bài kia bạn tự giải nha , mk lười lắm :)))))
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cau hoi nay la cau hoi co 3 chu so chu khong hai la 2chu so
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bài 2
Gọi số có 4 chữ số là : abcd
Nếu xóa chữ số hàng chục và đơn vị thì ta được số mới giảm đi 4455 đơn vị
=> abcd - ab =4455
=> ab x 100 + cd -ab =4455
=>99×ab+cd=45×99
=>cd=45×99−99×ab
=>cd=99×(45−ab)
Ta có: cd<100 ab)<100⇒45−ab=1 hoặc 45−ab>
+Nếu 45−ab=0thì ⇒ab=45;cd=99×0=0⇒cd=00
+Nếu 45−ab=1⇒ab=44;cd=99×1=99
Vậy số cần tìm là 4500 hoặc 4499.
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Tìm số tự nhiên có 4 chữ số biết rằng ta xóa đi chữ số hàng chục và hàng đơn vị thì ta được số nhỏ hơn số ban đầu 3663 đơn vị.
Tìm 1 số có 4 chữ số ,biết rằng nếu xóa đi chữ số hàng chục và hàng đơn vị thì ta được 1 số nhỏ hơn số đó 3663 đơn vị.
3700 và 3699 nha bạn chúc bạn học tốt !
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Tìm 1 số tự nhiên có 4 chữ số biết rằng nếu xóa đi chữ số hàng chục và hàng đơn vị thì ta được 1 số nhỏ hơn số đó 3663 đơn vị
Trả lời
Số tự nhiên cần tìm thỏa mãn yêu cầu đề bàu là:
3700. Vì 3700 bỏ chữ số hàng chục và hàng đơn vị thì ta được số mới là 37.
Và: 3700-37=3663.
Vậy thì 37 nhỏ hơn 3700 là 3663 đơn vị.
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tìm 1 số có 4 chữ số biết rằng nếu xoá đi chữ số hàng chục và hàng đơn vị thì ta được số nhỏ hơn số đó 3663 đơn vị
Gọi số có 4 chữ số cần tìm là \(\overline{abcd}\)
Theo đề ra, ta có: Khi xóa đi chữ số hàng chục và hàng đơn vị ta được số \(\overline{ab}\)
\(\overline{abcd}-\overline{ab}=3663\)
\(\overline{ab}\times100+\overline{cd}-\overline{ab}=3663\)
\(\overline{ab}\times99+\overline{cd}=3663\)
\(\overline{cd}=99\times\left(37-\overline{ab}\right)\)
Mà tích của 99 là một số tự nhiên bé hơn 100 nên có hai trường hợp là \(37-\overline{ab}=0\) hoặc \(37-\overline{ab}=1\)
Trường hợp 1: \(37-\overline{ab}=0\Rightarrow\overline{ab}=37\)
\(\Rightarrow\overline{cd}=0\)
Trường hợp 2: \(37-\overline{ab}=1\Rightarrow\overline{ab}=36\)
\(\Rightarrow\overline{cd}=99\)
Vậy số tự nhiên có 4 chữ số cần tìm là \(3700;3699\).
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Gọi số cần tìm là \(\overline{abcd}\)
Xóa đi chữ số hàng chục và hàng đơn vị ta được số ab
Theo bài ra ta có:
\(\overline{abcd}-\overline{ab}=3663\)
\(100.ab+cd-ab=3663\)
\(cd+100.ab-ab=3663\)
\(cd+99.ab=3663\)
\(\Rightarrow cd=99.\left(37-ab\right)\)
\(\Rightarrow37-ab=0\) hoặc \(37-ab=1\)
Nếu 37 - ab = 0 thì ab = 37 và cd = 00
Nếu 37 - ab = 1 thì ab=36 và cd = 99
Vậy số cần tìm là: 3700 và 3699
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Gọi số phải tìm là abcd. Xoá đi chữ số hàng chục và hàng đơn vị ta được số ab.
Theo đề bài ta có:
abcd – ab = 3663
100 x ab + cd – ab = 3663
cd + 100 x ab – ab = 3663
cd + 99 x ab = 3663
cd = 99 x (37 - ab)
37 – ab phải bằng 0 hoặc 1.
- Nếu 37 – ab = 0 thì ab = 37 và cd = 00.
- Nếu 37 – ab = 1 thì ab = 36 và cd = 99.
Số phải tìm là 3700 hoặc 3699.
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Tìm 1 số có 4 chữ số biết rằng nếu xóa đi chữ số hàng chục và hàng đơn vị thì được 1 số nhỏ hơn số đó 3663 đơn vị
Tìm một số có 4 chữ số biết rằng nếu xóa đi chữ số hàng chục và hàng đơn vị thì được 1 số nhỏ hơn số đo 3663 đơn vị .
Gọi hai chữ số hàng chục và đơn vị của số đó là ab.
Số nhỏ . 100 + ab = số lớn
Số nhỏ là 1 phần. Số lớn là 100 phần + ab.
Vậy 3663 - ab chia hết cho ( 100 - 1 ) = 99.
Vậy ab = 00 ; 99
Số phải tìm là:
( 3663 - 0 ) : 99 . 100 + 0 = 3700
Số phải tìm là:
( 3663 - 99 ) : 99 . 100 + 99 = 3699
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tìm stn có 4 chữ số , biết rằng nếu ta xoá đi chữ số hàng chục và chữ số đon vị thì ta được số nhỏ hơn số đó 3663 đơn vị
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fd
fg
g
g
g
g
g
g
g
g
g
g
g
g
g
yh
u
yt
tu
yt
eawr
we
r
tt
ryh
fyu
gfykhj
k
j
lhj
gi8
et
e
rsdth
dfyg
hndf
jfh
frghy
fg
h
f
j
fh
f
g
d
gf
h
fh
dhfg
dfhf
tr;dg
dg
g
fh
g
hg
g
gh
gg
h
hg
hg
h
t
t
t
t
t
sd
d
xdf
ghf
j
ghu
i
tfr
cxf
j
udse5ytr
77es
5
65
6
t
frf
g
c
g
tr
yt
f
v
g
v
tf
,
tfv
j
f
b
t
b
hy
n
gh
g
g
g
g
gf
41
4
4
2
42
24
24
24
24
24
2
5
2
24
44
2
45
452
2
12
2
2
22
4
1
24
4
4
5
42
4
14
2
42
24
25
4
4
44
5
tyhyf
tghy
f
h
fgh
dg
hg
fj
gh
k
jj
j
j
j
j
j
j
j
j
j
j
j
j
j
j
j
j
j
j
j
j
Đúng 0
Bình luận (0)