Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Gọi số tự nhiên cần là abc3 :
Khi đó nếu bỏ chữ số tận cùng thì số mới là abc
Ta có:
abc3 - abc = (1000a + 100b + 10c + 3) - (100a + 10b + c)
=> 900a + 90b + 9c + 3=1992
=> 900a + 90b + 9c=1989
=> 9(100a + 10b + c)=1989
=> 100a + 10b + c = 221
=> abc = 221
=> abc3 = 2213
Vậy số cần tìm là 2213
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
Bài giải
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
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 :)))))
cau hoi nay la cau hoi co 3 chu so chu khong hai la 2chu so
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 đó là abc
Ta có: abc-ab=707
abc=707+ab
ax100+bx10+c=707+ax10+b
ax100-ax10+bx10-b+c=707
ax90+bx9+c=707
Vì ax90=707-bx9-c
Mà 707-bx9-c không quá 617
nên ax90 chỉ có thể bàng 630 và a=7
bx9+c=707-630
bx9+c=77
bx9=77-c
mà 77-c không quá 68
Suy ra bx9=72
và b=8
c=77-72
c=5
Vậy abc=785
Gọi số đó là abc
Ta có: abc-ab=707
abc=707+ab
ax100+bx10+c=707+ax10+b
ax100-ax10+bx10-b+c=707
ax90+bx9+c=707
Vì ax90=707-bx9-c
Mà 707-bx9-c không quá 617
nên ax90 chỉ có thể bàng 630 và a=7
bx9+c=707-630
bx9+c=77
bx9=77-c
mà 77-c không quá 68
Suy ra bx9=72
và b=8
c=77-72
c=5
Vậy abc=785
