A) ab.101=ab
B) abc. 7 .11.13=abcabc
k mình nha
ab . 101 = abab
abc . 7 . 11 . 13 = abc . 1001 = abcabc
A, ab.101
= ab . (100 + 1)
= ab.100 + ab
= ab00 + ab
= abab
B, abc.7.11.13
= abc.1001
= abc.(1000 + 1)
= abc.1000 + abc
= abc000 + abc
= abcabc