Có A = 27 . 58 - 31 = ( 26 + 1 ) . 58 - 31 = 26 . 58 + 58 - 31 = 26 . 58 + 27
B = 27 + 58 . 26
Có 26 . 58 + 27 = 27 + 58 . 26
=> A = B
A=27.58-31
A=(26+1).58-31
A=26.58+58-31
A=26.58+27
B=27+58.26
=> A=B.
Ta có : A= 27.58-31
=> A = ( 26+ 1 ) . 58 - 31
=> A = 26. 58 + 58 - 31
=> A= 26 . 58 + 37
Vậy A = B