a) 3. $5^{2}$ - 8 : $2^{2}$ = 3 . 25 - 8 : 4
= 75 - 2
= 73
b) (39.45-37.45):45 = 45.(39-37) :45
= 45.2:45
= 90 : 45
= 2
c) 2448:[119-(23-6)] = 2448:[119-117]
= 2448:2
= 1224
d) 2³.17-2³.14 = $2^{3}$ . (17-14)
= $2^{3}$.3
= 8.3
= 24
e) 15.141+59.15= 15.(141+59)
= 15.200
= 3000
f) 17.85+15.17-120 = 17.(85+15) - 120
= 17.100-120
= 1700-120
= 1580
k) 370+46+54+30=(370+30)+(46+54)
= 400+100
= 500
m) 37.53+37.57 = 34.(53+57)
= 34.110
= 3740
CHÚC BẠN HỌC TỐT!
BY@CUGIAI2K9
NOCOPY#