Tìm số có 4 chữ số biết nếu xóa chữ số hàng chục thì số đó giảm đi 1188 đơn vị.
giải ra nhé.
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
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!!!
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
các bạn giúp mình giải nha.mình xin cảm ơn các bạn đã giúp mình
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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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) \(\Rightarrow99x\overline{ab}=1188-99\Rightarrow\overline{ab}=11\)
\(\Rightarrow\overline{abcd}=1199\)
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
Vậy số đó = 1200
Học vv!
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
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