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abc1 = 2abc x 3
abc x10 +1 = (2000 + abc)x3
abc x10 + 1 = 6000 + abc x 3
abc x 7 = 5999
abc = 857
abc1 = 2abc x 3 abc x10 +1 = (2000 + abc)x3 abc x10 + 1 = 6000 + abc x 3 abc x 7 = 5999 abc = 857 axb=5.(0<a,b<=5) a=5xb. Nen b = 1( vi a <hoac = 5) vay a=5
gọi số cần tìm là ab
ta có:
ab * 87 = 1ab1
vì b * 7 có tận cùng là 1 mà chỉ có 7 * 3 có tận cùng = 1 nên b = 3
sau đó : a3 * 87 = 1a31 ( số có 2 chữ số khi nhân với 87 có tích là số có bốn chữ số mà có hàng nghìn và tận cùng = 1 vậy chỉ có số 13 . Vì 3 * 7 = 21 và có tận cùng = 1 mà 13 * 87 = 1131 thỏa mãn yêu cầu của đề bài nên => số cần tìm là 13
chúc bạn hok tốt nhớ k nha
Gọi số cần tìm là ab thì số mới là 1ab1
Theo bài ra ta có: 1ab1 = ab × 87
1000 + ab × 10 + 1 = ab × 87
1001 + ab × 10 = 10 × ab + 77 × ab (trừ mỗi vế 10 lần ab)
1001 = 77 × ab
Vậy số cần tìm là:
1001 : 77 = 13
ĐS:13
ta gọi số đó là abcd theo đề bài ta có :
6abcd = 25 x abcd
60000 + abcd = 25 x abcd
60000 = 24 x abcd
abcd = 60000 : 24
abcd = 2500
số đó là 2500 nha bạn
nha bạn
Gọi số đó là :abcd
Ta có:
abcd x25=6abcd
abcdx25=60000+abcd
abcdx25-abcd=60000
abcd.(25-1)=60000
abcd.24=60000
abcd=60000:24
abcd=2500
Gọi 3 số là abc
theo đb ta có
abc1=3 x 2abc
abc x 10 +1 =3x 2000+3abc
7 abc= 5999
abc=857
vậy số đó là 857
857 dung 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Gọi số phải tìm là ab
Số mới là 2ab
Theo bài ra ta có : 2ab + ab = 346
Suy ra 200 + ab + ab = 346
=> 200 + 2 . ab = 346
=> 2 . ab = 346 - 200
=> 2 . ab = 146
Do đó ab = 146 : 2 = 73
Vậy số phải tìm là 73 .
Nhớ nhé ! ^ . ^
Gọi số cần tìm là ab
Theo bài ra ta có:
2ab + ab = 346
200 + ab + ab = 346
200 + ab . 2 = 346
ab . 2 = 346 - 200
ab . 2 = 146
=> ab = 73
Vậy số cần tìm là 73
khi viết thêm chữ số 2 vào bên trái số có 3 chữ số thì số đó tăng lên 2000 đơn vị
coi số phải tìm là 1 phần thì
số mới là 9 phần như thế
hiệu là 2000
số phải tìm là
2000 : ( 9 - 1 ) = 250
đáp số 250
chắc chắn
đề sai rồi bạn ạ
Mình thấy đề nó hơi thíu thíu cái gì đó bạn ak ! Chắc bạn nên xem lại đề và đăng lại thì ok hơn !