a) 7 . 5² - 24 : 2²
=7 . 25 - 24 : 4
= 175 - 6
= 169
b) $5^{3}$ . 20 - $5^{3}$ : 17
= 125 . 20 - 125 . 17
= 125 . ( 20 - 17 )
= 125 . 3
= 375
c)47 . 313 + 87 . 47
= 47 . ( 313 + 87 )
= 47 . 400
= 18800
d)200 : [ 117 - ( 23 - 6 )]
= 200 : [ 117 - 17 ]
= 200 : 100
= 2
e)$7^{7}$ : $7^{5}$ + $2^{2}$ . $2^{3}$
=$7^{7-5}$ + $2^{2+3}$
=$7^{2}$ + $2^{5}$
= 49 + 32
=81
f)( 48 . 52 - 46 . 52 ) : 52
= [52. ( 48 - 46 ) ] : 52
= (52 . 2) : 52
= 104 : 52
= 2
Hok tốt nka ≈≈
