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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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Gọi số phải tìm là ab
Số mới là 2ab2 . Ta có
2ab2=ab×36
2002+ab×10=(ab×10)+(ab×26)
2002=ab×26
ab=77
Gọi số phải tìm là ab Số mới là 2ab2 . Ta có 2ab2=ab×36 2002+ab×10=(ab×10)+(ab×26) 2002=ab×26 ab=77
abc1 = 2abc x 3
abc x10 +1 = (2000 + abc)x3
abc x10 + 1 = 6000 + abc x 3
abc x 7 = 5999
abc = 857
gọi số phải tìm là abcde (a khác0)
theo bài ra ta có :
abcde2=2abcde*3
abcde2=200000+abcde*3
abcde*10+2=200000+abcde*3
abcde*7+2=200000
abcde*7=200000-2
abcde*7=199998
abcde=199998/7
abcde=28571,1428571
=> 1 là đề sai ;2 là mình sai hjhj
Gọi số cần tìm là ab
Ta có : ab x 23 = 1ab1
ab x 23 = 1000 + ab x 10 + 1
ab x 23 - ab x 10 = 1000 + 1
ab x 13 = 1001
ab = 1001 : 13
ab = 77
Vậy số phải tìm f là 77.
Gọi số cần tìm là ab, vói a, b là chữ số
1ab1 = ab x 23
1000 + 100a + 10b + 1 = 230a + 23b
230a - 100a + 23b - 10b = 1000 + 1
130a + 13b = 1001
13 x (10a + b) = 1001
10a + b = 1001 : 13 = 77
ab = 77
Số cần tìm là 77
Gọi số cần tìm là abc (a khác 0; a; b; c khác 0)
Hai Số mới là: abc1; 2abc
Theo bài cho : Số này gấp 3 lần số kia
+) Nếu abc1 = 3 x 2abc
=> abc0 + 1 = 3 x (2000 + abc)
=> abc x 10 + 1 = 6000 + 3 x abc
=> abc x 7 = 5999
=> abc = 5999 : 7 = 857
+) Nếu 2abc = 3 x abc1
=> 2000 + abc = 3 x (abc0 + 1)
=> 2000 + abc = abc x 30 + 3
=> 1997 = abc x 29
Vì abc > 100 => abc x 29 > 100 x 29 = 2900 > 1997
Vậy không tồn tại số abc thỏa mãn
Vậy số cần tìm là 857
Gọi số đó là abc.Ta có:
abc8=2*1abc
=>abc*10+8=2*1000+2*abc
=>abc*10-abc*2=2000-8
=>abc*8=1992
=>abc=1992:8
=>abc=249
Vậy số cần tìm là 249
Gọi số cần tìm là abc:
Ta có:
abc8 = 2 x 1abc
abc x 10 + 8 = 2000 x abc + 2 x abc
abc x 10 - abc x 2 = 2000 - 8
abc x 8 = 1992
abc = 1992 : 8
abc = 249
Vậy số cần tìm là 249