Question

ab+407=ab2

giup minh nha

Answer 1

Ta có:

ab + 407 = ab2

=> ab + 407 = 10 x ab + 2

=> 10 x ab - ab = 407 - 2

=> 9 x ab = 405

=> ab = 405 : 9 = 45

Answer 2

ab + 407 = ab2

ab + 407 = ab . 10 + 2

407 - 2 = ab . 10 - ab

405 = ab . 9

=> ab = 405 : 9

=> ab = 45