`a)`
`10^10 .(-10)^4`
`=10^10 . (-10) .(-10) .(-10) . (-10)`
`=10^10 . 10000`
` = 10^10 . 10^4`
` = 10^(10 + 4) =10^14`
`b)`
`(-2) .(-2) .(-2) .(-2) .(-2) + 2^5`
`= (-2)^5 + 2^5` ( đối nhau)
` = 0`
`c)`
`(-3) .(-3) . (-3) . (-3) - 3^4`
` =(-3)^4 - 3^4`
` = 0`