Tính nhanh
a, ( 2400 + 72 ) : 24
b, ( 3600 – 180 ) : 36
c, ( 525 – 315 ) : 15
d, ( 1026 – 741 ) : 57
e, 100: 24 – 52 : 24
f, 18 : 9 + 32 : 9 + 40 : 9
g) 23 : 8 + 35 : 8 – 10 : 8
h) 94 : 11 – 15 : 11 + 20 : 11
i) 37.138 – 38.37
k) ( 77.45.24 ) : ( 8.9.11 )
l) ( 25 + 3.75 – 250 ) : ( 2014.2015.2016 + 2017.2018.2019 )
m) ( 25.36363 – 2525.36 ) : ( 2011.2012.2013…2020 )
Tính nhanh a, ( 2400 + 72 ) : 24 b, ( 3600 – 180 ) : 36 c, ( 525 – 315 ) : 15 d, ( 1026 – 741 ) : 57 e, 100: 24 – 52 : 24 f, 18 : 9 + 32 : 9 + 40 :
By Natalia
a,(2400+72):24=(2400:24)+(72:24)=100+3=103
b,(3600-180):36=(3600:36)-(180:36)=100-5=95
c,(525-315):15=(525:15)-(315:15)=35-21=14
d,(1026-741):57=(1026:57)-(741:57)=18-13=5
e,100:24-52:24=(100-52):24=48:24=2
f,18:9+32:9+40:9=(18+32+40):9=90:9=10
g,23:8+35:8-10:8=(23+35-10):8=48:8=6
h,94:11-15:11+20:11=(94-15+20):11=99:11=9
i,37.138-38.37=37.(138-38)=37.100=3700
k,(77.45.24):(8.9.11)=(77:11).(45:9).(24:8)=7.5.3=105
l,(25+3.75-250):(2014.2015.2016+2017.2018.2019)=(25+225-250)(2014.2015.2016+2017.2018.2019)=0:(2014.2015.2016+2017.2018.2019)=0
m,(25.3636-2525.36):(2011.2012.2013….2020)=(90900-90900):(2011.2012.2013…2020)=0
a/ `(2400+72):24`
`=2400:24+72:24`
`=100+3`
`=103`
b/ `(3600-180):36`
`=3600:36-180:36`
`=100-5`
`=95`
c/ `(525-315):15`
`=525:15-315:15`
`=35-21`
`=14`
d/ `(1026-741):57`
`=18-13`
`=5`
e/ `100:24-52:24`
`=(100-52):24`
`=48:24`
`=2`
f/ `18:9+32:9+40:9`
`=(18+32+40):9`
`=90:9`
`=10`
g/ `23:8+35:8-10:8`
`=(23+35-10):8`
`=48:8`
`=6`
h/ `94:11-15:11+20:11`
`=(94-15+20):11`
`=99:11`
`=9`
i/ `37.138-38.37`
`=37.(138-38)`
`=37.100`
`=3700`
k/ `(77.45.24):(8.9.11)`
`=(77:11).(45:9).(24:8)`
`=7.5.3`
`=105`
l/ `(25+3.75-250):(2014.2015.2016+2017.2018.2019)`
`=(25+225-250):(2014.2015.2016+2017.2018.2019)`
`=(250-250):(2014.2015.2016+2017.2018.2019)`
`=0:(2014.2015.2016+2017.2018.2019)`
`=0`
m/ `(25.3636-2525.36):(2011.2012.2013…2020)`
`=(25.101.36-101.25.36):(2011.2012.2013…2020)`
`=0:(2011.2012.2013…2020)`
`=0`
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