gấp mấy

Gọi số cần tìm là ab

Theo đề ra ta có :

32ab = ab x 81

3200 + ab = ab x 81

3200 = ab x 81 - ab

3200 = ab x 80

ab = 3200 : 40

ab = 40

Vậy số cần tìm là 40

dùng cấu tạo số : 

số phải tìm là abc ( a >0)

theo đề bài ta có  abc x 81 = 32abc

                             abc x 81 = 32000 + abc

                             abc x 80 = 32000 ( bớt 2 vế cho abc )

                             abc = 32000 : 80 = 400

Hoặc : số phải tìm là 1 phần thì số mới là 81 phần và hơn số phải tìm 32000 ( vì thêm 32 vào bên trái ) )

số phải tìm là 32000 : ( 81 - 1 ) = 400

= 400 nhé

ko muốn động não em tự nghĩ nhé

abc1 = 2abc x 3
abc x10 +1 = (2000 + abc)x3
abc x10 + 1 = 6000 + abc x 3
abc x 7 = 5999
abc = 857

bai nay ra 100000000 nhe ban 

Gọi số có 5 chữ số cần tìm là x (x ∈ N; 10000 ≤ x ≤ 99999)

Khi thêm 1 vào bên phải số đó ta được số mới là số có 6 chữ số với chữ số hàng đơn vị là 1:

Khi đó số đã cho là số chục và số mới được viết là: 10x + 1.

Khi thêm 1 vào bên trái số đó ta được số mới là số có 6 chữ số với chữ số hàng trăm nghìn là 1

Khi đó số đã cho là số đơn vị và số mới được viết là: 100000 + x.

Theo đề bài ra nếu viết thêm 1 vào bên phải số đó thì được một số lớn gấp ba lần số nhận được khi ta viết thêm 1 vào bên trái số đó nên ta có phương trình

10x + 1 = 3(100000 + x)

⇔ 7x = 299999

⇔ x = 42857 (tmđk)

Vậy số cần tìm là 42857

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 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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