Bài `2` :
`a, 3^{2} + 4^{2}`
`= 25 = 5^{2}`
`b, 5^{2} + 12^{2}`
`= 5.5 + 12 .12`
`=25 + 144`
`= 169 = 13^{2}`
`c, 17^{2} - 25^{2}`
`= 289 - 625`
`= -336 = ±√336`
Bài `3` :
`a, 4^{3} = 2^{6}`
`b, 32^{4} = 2^{64}`
`c,128^{2} = 2^{128}`
Bài `4` :
`a, 15^{5} = 15^{3}.15^{2}`
`b,24^{4} = 24^{3} . 24`
`c, 18^{3} = 18^{2} . 18`
`d, 36^{4} = 36^{2} . 36^{2}`