Question

tìm số abc,biết:

1abc  = abc x 9

zdsd

 

Answer 1

1abc = abc x 9

abc x 9 = 1abc

abc x 9 = 1000 + abc 

abc x 8 = 1000 ( bớt 2 vế đi abc )

abc = 1000 : 8

abc = 125

Answer 2

1abc = abc x 9

1000 + abc = abc x 9

1000 = abc x 8

1000 : 8 = abc

125 = abc

vậy abc = 125

Answer 3

1000 + abc = abc * 9

<=> abc x 9 = 1000 + abc 
<=> abc x 9 - abc = 1000 
<=> 8 x abc= 1000 
<=> abc = 1000/8 
<=> abc = 125

Answer 4

1000+abc=abcx9

1000=abcx8

1000:8=abc

125=abc

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