Chứng tỏ 8^7-2^18 chia hết cho 14; Có 3a-b/a+b =3/4. Hãy tính a/b

Question

1, Chung to: 8^7-2^18chia het 14

2, 3a-b/a+b =3/4. Tinh a/b(la phan so day)

Answer 1

he he tu dung nghi ra cau 1:

=8^6*8-8*6

=8^6*7

= 8^5*14

vi 14 chia het 14

suy ra dpct