C=đền bài
Ta có:2222 +4 hia hết cho 7 suy ra 2222=-4 (mod7)
suy ra :2222\(^{55555}\)=(-4)\(^{5555}\)(mod7) 55555-4 chia hết cho 7 suy ra 5555=4(mod7)
suy ra 55555\(^{2222}\)=4\(^{2222}\)(mod7)
suy ra 2222\(^{55555}\)5555\(^{2222}\)=(-4)\(^{5555}\)+4\(^{2222}\)(mod7)
mà 4\(^{2222}\)=(-4)\(^{2222}\) suy ra (-4)\(^{5555}\)+4\(^{2222}\)= tự lm típ nha bn mẹt quá