(ko bt đúng sai đâu nhá!)
2)
200 : [ 117 -( 23-2.3 ) ]
= 200:[117-(23-6)]
= 200:[117-17]
= 200:100
= 2
4)
2020-[45-(6-1)2 ] + 19920
= 2020 - [45-52 ] + 19920
= 2020 - 402 + 1
= 2020 - 1600 + 1
= 420 +1
= 421
6)
480 : [75 + (72 - 8.3) : 5 ] + 20210
= 480 : [ 75+( 49 - 24 ): 5 ] + 20210
= 480: [ 75 + 25 : 5 ] + 20210
= 480 : [ 75 + 5 ] + 20210
= 480 : 80 + 1
= 6 + 1
= 7
8)
24 . 5 - [ 131 - (13 - 4)2 ]
= 104 - [ 131 - 92 ]
= 104 - 50
= 10000 - 50
= 9950
(19920 = 1 : 20210=1)