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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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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
Goi so can tim la ab
Viet them so 3 duoc ab3
Ta co : 3ab = ab x 5
300 + ab = ab x 5
300 + ab = ab x ( 4 + 1 )
300 + ab = ab x 4 + ab
300 = ab x 4
ab = 300 : 4
ab = 75
tk mink nha
Ta coi số đó là abc:
abc x 6=3abc
abc x 6 = 3000 +abc
Ta bớt mỗi bên abc, ta có:
abc x 6 -abc=3000 +abc - abc
abc x 5 =3000
abc=3000:5
abc=600
Vì ta viết thêm chữ số 3 vào bên trái của một số có 3 chữ số ta được số mới nên số mới hơn số ban đầu là: 3000 đơn vị
Ta có sơ đồ:
Theo sơ đồ ta có: Số cũ là 3 000 : (6 - 1) = 600
Đáp số: 600
