tìm số có 4 chữ số biết xóa đi chữ số hàng đơn vị và hàng chục số đó giảm 1188 đơn vị
tìm số có 4 chữ số biết xóa đi chữ số hàng đơn vị và hàng chục số đó giảm 1188 đơn vị
Gọi số cần tìm là \(\overline{abcd}\) Theo đề bài
\(\overline{abcd}-\overline{ab}=1188\)
\(\Rightarrow100x\overline{ab}+\overline{cd}-\overline{ab}=1188\)
\(\Rightarrow99x\overline{ab}=1188-\overline{cd}\) (1)
Ta có
\(99x\overline{ab}⋮99\Rightarrow1188-\overline{cd}⋮99\)
Mà \(1188⋮99\Rightarrow\overline{cd}⋮99\Rightarrow\overline{cd}=0\) hoặc \(\overline{cd}=99\)
+ Với \(\overline{cd}=0\) thay vào (1) \(\Rightarrow99x\overline{ab}=1188\Rightarrow\overline{ab}=1188:99=12\)
\(\Rightarrow\overline{abcd}=1200\)
+ Với \(\overline{cd}=99\) thay vào (1) \(\Rightarrow99x\overline{ab}=1188-99\Rightarrow\overline{ab}=11\)
\(\Rightarrow\overline{abcd}=1199\)
tìm số có 4 chữ số ,biết rằng nếu xóa chữ số hàng đơn vị và hàng chục thì số đó sẽ giảm đi 1188 đơn vị
gọi số cần tìm là abcd .
ta có :
ab + 1188 = abcd
ab + 1188 = ab x 100 + cd
1188 + cd = ab x 99
suy ra ab = 12
và cd = 00
đ/s : 1200
nhé !
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 = 4455
100 x ab + cd – ab = 4455
cd + 100 x ab – ab = 4455
cd + 99 x ab = 4455
cd = 99 x (45 – ab)
Ta nhận xét tích của 99 với 1 số tự nhiên là 1 số tự nhiên nhỏ hơn 100. Cho nên 45 – ab phải bằng 0 hoặc 1.
- Nếu 45 – ab = 0 thì ab = 45 và cd = 0.
- Nếu 45 – ab = 1 thì ab = 44 và cd = 99.
Số phải tìm là 4500 hoặc 4499
Ta có 1188 + ab= abcd
Nếu ờ hàg chục là phép cộg k nhớ thì ab = 11, suy ra cd là 99. Số 1199.
Nếu ở hàg chục là phép cộg có nhớ thì ab = 12, suy ra cd là 00. Số 1200
Tìm số tự nhiên có 4 chữ số .biết rằng nếu xóa đi chữ số ở hàng đơn vị và hàng chục thì số đó giảm đi 1188 đơn vị
các bạn giúp mình giải nha.mình xin cảm ơn các bạn đã giúp mình
bạn vào câu hỏi tương tự nha !!!!!!!!!!!!
Tìm một số có 4 chữ số, biết rằng nếu xóa đi chữ số hàng đơn vị và chữ số hàng chục thì số đó giảm đi 1188 đơn vị
[ Trình Bày lời giải ]
xóa chữ số hđv thì số đó giảm 10 lần
số ban đầu là: 1188:(10-1)=132
đáp số:...
mk nghĩ bài này chỉ tìm dc số có 3 chữ số thôi, k mk nhé
16383
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bạn muốn chép trên này hả Nguyễn Tuấn Anh lớp 5a ?
Tím số có 4 chữ số biết rằng nếu ta xóa đi chữ số hàng chục và hàng đơn vị thì số đó giảm đi 1188 đơn vị
Tìm số có 4 chữ số ,biết rằng nếu xóa đi chữ số ở hàng đơn vị và chữ số o hàng chục thì số đó sẽ giảm đi 1188 đơn vị
các bạn giúp mình với nhé
Gọi các chữ số hàng nghìn , trăm , chục , đơn vị lần lượt là abcd
Theo đề bài ta có:abcd = 1188+ab
Trong phép cộng, khi cộng 2 chữ số trong cùng một hàng thì có nhớ nhiều nhất là 1 nên ab chỉ có thể là 11 hoặc 12
Nếu ab = 11 thì abcd =1188 + 11 = 1199
Nếu ab = 12 thì abcd = 1188 + 12 = 1200
Vậy ta tìm đc 2 số thỏa mãn đề bài là : 1199 và 1200
Đs:1199 và 1200
Nhớ k mk nhe!!!
Tìm số có 4 chữ số biết nếu xóa chữ số hàng chục thì số đó giảm đi 1188 đơn vị.
giải ra nhé.
tìm số có 4 chữ số biết nếu xóa chữ số hàng đơn vị thì số đó giảm đi 1188 dơn vị
Gọi số cần tìm là abcd (a\(\ne\)0; a;b;c;d < 10)
Theo bài ra ta có:
abcd - abc = 1188
\(\Rightarrow\)10 x abc + d - abc = 1188
\(\Rightarrow\)9abc + d = 1188
\(\Rightarrow\)abc = (1188 - d) : 9
\(\Rightarrow\)d là số dư trong phép chia của 1188 cho 9 và abc là thương của phép chia đó
Ta có: 1188 : 9 = 132 (dư 0)
Vậy d = 0; abc = 132
Vậy số cần tìm là 1320
tìm số có 4 chữ số biết nếu xóa chữ số hàng chục thì số đó giảm đi 1188 đơn vị ?
giải chi tiết
Ta có 1188 +ab= abcd(đặt tính theo cột dọc nha).
Nếu ờ hàg chục là phép cộg k nhớ thì ab = 11, suy ra cd là 99.
Số 1199. Nếu ở hàg chục là phép cộg có nhớ thì ab = 12, suy ra cd là 00. Số 1200