a, 199²⁰ = (199²)¹⁰⁰=(......9)¹⁰⁰

                           =(....9²)⁵⁰ =(...1)⁵⁰=.....1

     2003¹⁵=(2003⁵)³=(...3)³⁼=....1

Suy ra hai lũy  thừa  = nhau

o 6 goc ngoai

chu ban viet dep the

dep hon chu mk gap van lan

a) 2367 - x = 205 + 1017

2367 - x = 1222

x = 2367 - 1222

x = 1145

b) 5 . ( x + 35 ) = 515

x + 35 = 515 : 5 

x + 35 = 103

x = 103 - 35 

x = 68