A)
1)a)7^19.7^14=7^33
b)5^25.25=5^25.5^2=5^27
c)2^22:4=2^22:2^2=2^20
d)3^25:3^7=3^18
e)2^45.(2^6.32)=2^45.(2^6.2^5)=2^45.2^11=2^56
f)(-3)^8.3^20:27=3^8.3^20:3^3=3^25
B)
1)a)*∈{2;5;8}
b)*∈{0;9}
c)*∈{0}
d)*1∈{9}
*2∈{0}
2) a)1307 b)2780 c)15136 d)8001
số dư chia cho 3 2 2 1 0
số dư chia cho 9 2 8 7 0
Chúc bạn học tốt!