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
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