Question

[Ultra Instinct]

Tìm chữ số tận cùng

a) 2002^2015

b) 43^1995.67^1001

c) 98.98^4.98^7....98^10

d) 111^111.1006^1006

Answer 1

[See you again]

a)\(2002^{2015}=2002^{2012}.2002^3\)   

\(\left(...6\right).\left(...8\right)=...8\)

b)\(43^{1995}.67^{1001}=\left(43^{1992}.43^3\right).\left(67^{1000}.67\right)\)

\(=\left[\left(...1\right).\left(...7\right)\right].\left[\left(...1\right).67\right]\)

\(=\left(...7\right).\left(...7\right)=...9\)

c)\(98.98^4.98^7.98^{10}=98^{22}\)

\(=98^{20}.98^2=\left(...6\right).9604=...4\)

d) \(111^{111}.1006^{1006}=\left(...1\right).\left(...6\right)=...6\)

Answer 2

[Ultra Instinct]

CHỈ CHO MINK CÁCH GIẢI