Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
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
10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000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bo chu so 1o hang nghin thi so cu hon so moi 1000 don vi
hieu so phan ban nhau la:
5-1=4(phan)
so moi la:
1000:4=250
vay so can tim la:1250
Ta có: 4455 : (10 - 1) = 495 (không dư)
Vậy chữ số hàng đơn vị của số cần tìm là 0 và số ban đầu gấp 10 lần số mới
Số mới là:
4455 : (10 - 1) = 495
Số cần tìm là:
495 x 10 = 4950
Đáp số: 4950
Ta có: 4455 : (10 - 1) = 495 (không dư)
Vậy chữ số hàng đơn vị của số cần tìm là 0 và số ban đầu gấp 10 lần số mới
Số mới là:
4455 : (10 - 1) = 495
Số cần tìm là:
495 x 10 = 4950
Đáp số: 4950
Gọi số cần tìm là abcd. Xóa 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
ad + 100 x ab - ab = 4455
cd + 99 x ab = 4455
cd = 99 x ( 45 - ab )
Ta nhận xét tích của 99 với một số tự nhiên là 1 số tự nhiên nhỏ hơn 100. Cho nên 45 - ab phải = 0 hoặc 1.
Nếu 45 - ab = 0 thì ab = 45 và cd = 0
Nếu 45 - ab = 1 thì ab = 44 và cd = 99
=> Số cần phải tìm là 4500 hoặc 4499
Theo đề bài ra, ta có:
ab = 5 x ( a + b )
Vì 5 x (a+b) có tận cùng bằng 0 hoặc 5 nên b = 0 hoặc = 5
nếu b = 0, thay vào ta có:
a5 = 5 x (a+5)
10 x a + 5 = 5 x a + 25
tính ra được a = 4
thử lại: 45 : (4+5) = 5.
=> số đó là 45
càng nhanh càng tốt dù sai hay đúng thì ko sao cô mình bảo là đây là dạng tìm số tự nhiên dựa vào phân tích cấu tạo số mình ngồi nghĩ mãi mà ko ra
ko triinh bày chi tiết cũng được