thông cảm cho mik vì ko có nút ấn số mũ       SORRY

4+x=3 mũ 5:3 mũ1

=4+x=3 mũ 4

=4+x=81

x=81-4

x=77

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vì 654729045 cia hết cho 3 nên chia hết 

7 giờ 45 phút+15 phút=8 giờ

vậy ta nói AN đi lúc 8 giờ

ý A nha nếu thấy đúng thi cho mik 1 like nhé