a,abc.126=15abc

abc.126=15000+abc

abc.125=15000

abc=15000:125

abc=120

b,1abc.2=abc8

(1000+abc).2=10.abc+8

2000+2.abc=10.abc+8

1992=8.abc

abc=1992:8

abc=249

\(15abc:abc=121\)

\(\left(15000+abc\right):abc=121\)

\(15000:abc+abc:abc=121\)

\(15000:abc+1=121\)

\(15000:abc=120\)

\(abc=15000:120\)

\(abc=125\)

125

125

125

abc = 120

\(\overline{abc}\times126=\overline{15abc}\)

\(\Leftrightarrow\overline{abc}\times126=15000+\overline{abc}\)

\(\Leftrightarrow\overline{abc}\times\left(126-1\right)=15000\)

\(\Leftrightarrow\overline{abc}\times125=15000\)

\(\Rightarrow\overline{abc}=15000\div125=120\)

Hiệu của 2 số đã cho là:

               15abc - abc = 15000 

Số abc là:

               15000 : (126 - 1) = 120

                         Đáp số: 120

Ta có

101 x abc = 15abc

101 x abc = 15000 + abc (phân tích số)

100 x abc = 15000 (cùng bớt đi abc )

Đây đây bạn tự làm để ra đáp số abc nhé

\(\Leftrightarrow15abc:abc=101\)

\(\Leftrightarrow\left(15000+abc\right):abc=101\)

\(150:abc+abc:abc=101\)

\(\Leftrightarrow15000:abc+1=101\)

\(\Leftrightarrow15000:abc=100\)

\(\Leftrightarrow abc=15000:100\)

\(\Leftrightarrow abc=150\)

a)15abc:abc=121

(15000+abc):abc=121

15000:abc+1=121

15000:abc =120

abc=125

b)abab+ab=2550

ab.101+ab.1=2550

ab.(101+1)=2550

ab.102=2550

ab=25

15abc:abc=121

(15000+abc):abc=121

15000:abc+abc:abc=121

15000:abc+1=121

15000:abc  =120

abc=15000:120=125

Cho mk 1 like nha!!!!

abab+ab=2550

ab*101+ab=2550

ab*(101+1)=2550

ab*102=2550

ab=2550:102=25

15abc : abc = 101

( 15000 + abc ) : abc = 101

15000 : abc + abc : abc = 101

15000 : abc + 1 = 101

15000 : abc = 100

             abc = 15000 : 100

             abc = 150

Vậy ............................ 

15abc : abc = 101
( 15000 + abc ) : abc = 101
15000 : abc + abc : abc = 101
15000 : abc + 1 = 101
15000 : abc = 100
             abc = 15000 : 100
             abc = 150

Ta có:

15abc : abc = `101

(15000 +abc) : abc = 101

15000 : abc + abc : abc = 101

15000 : abc + 1 = 101

15000 : abc = 100

abc = 15000 : 100

abc = 150

Vậy số dó là 150

Theo đề ta có :

\(\overline{15abc}:\overline{abc}=101\)

\(\Rightarrow\overline{15abc}=101.\overline{abc}\)

Có : \(\overline{15abc}=10000+5000+100a+10b+c=15000+\overline{abc}\)

\(\Rightarrow15000+\overline{abc}=101.\overline{abc}\)

\(\Rightarrow15000=101.\overline{abc}-\overline{abc}\)

\(\Rightarrow15000=\overline{abc}.\left(101-1\right)\)

\(\Rightarrow15000=\overline{abc}.100\)

\(\Rightarrow\overline{abc}=15000:100=150\)

Tick mik nhé!

À mình bị nhầm đề nha

Làm lại:

Ta có:

\(\overline{15abc}:\overline{abc}=101\)

\(\Rightarrow\left(15000+\overline{abc}\right):\overline{abc}=101\)

\(\Rightarrow15000:\overline{abc}+\overline{abc}:\overline{abc}=101\)

\(\Rightarrow15000:\overline{abc}+\overline{abc}:\overline{abc}=101\)

\(\Rightarrow15000:\overline{abc}+1=101\)

\(\Rightarrow15000:\overline{abc}=100\)

\(\Rightarrow\overline{abc}=150\)