Question

Tìm các chữ số a , b , c , d , biết rằng :

  ____          ____

a) 1ab  +36 = ab1

  ____  ____  ___   ____

b) abc + acc +dbc = bcc

  ___      ___    __      

c)abcd + abc + ab + a = 4321

Answer 1

a. 1ab + 36 = ab1

=> 100 + 10a + b + 36 = 100a + 10b + 1

=> 10a + b + 136 = 100a + 10b + 1

=> 135 = 90a + 9b

=> 9ab = 135

=> ab = 15

b. abc + acc + dbc = bcc

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c. abcd + abc + ab + a = 4321

https://olm.vn/hoi-dap/detail/8572370835.html

Answer 2

a. 1ab + 36 = ab1

=> 100 + 10a + b + 36 = 100a + 10b + 1

=> 10a + b + 136 = 100a + 10b + 1

=> 135 = 90a + 9b

=> 9ab = 135

=> ab = 15

b. abc + acc + dbc = bcc

https://olm.vn/hoi-dap/detail/9768579821.html

c. abcd + abc + ab + a = 4321

https://olm.vn/hoi-dap/detail/8572370835.html