a, Ta có : 45 = 32 . 5
75 = 3 . 52
=> ƯCLN(45;75) = 3 . 5 = 15
b, Ta có : 36 = 22 . 32
48 = 24 . 3
=> BCNN(36;48) = 24 . 32 = 144
a) ƯCLN (45,75)
45 = 32 . 5
75 = 3 . 52
ƯCLN (45,75) = 3 . 5 = 15
b) BCNN (36,48)
36 = 22 . 32
48 = 24 . 3
BCNN (36,48) = 24 . 32 = 144
1/ 59 - [ 59 + ( -76 )
= 59 - ( -17 )
= 76