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a) 3.52 + 15.22 - 26 : 2
= 3.25 + 15.4 - 13
= 75 + 60 - 13
= 135 - 13
= 122
b) 2021 + 5.[300 - (17 - 7)2]
= 2021 + 5.[300 - 102]
= 2021 + 5.[300 - 100]
= 2021 + 5.200
= 2021 + 1000
= 3021
c) 32.5 + 23.10 - 81
= 9.5 + 8.10 - 81
= 45 + 80 - 81
= 125 - 81
= 44
a) 3.52 + 15.22 - 26 : 2
= 3. 25 + 15 . 4 - 26 : 2
= 75 + 60 - 13
= 135 - 13
= 122
b) 2021 + 5[300 - (17 - 7)2 ]
= 2021 + 5[300 - 102 ]
=2021 + 5[300 - 100]
=2021 + 5.200
=2021 + 1000
= 3021
c) 32 . 5 + 23 . 10 - 81
= 9 . 5 + 8 . 10 - 81
= 45 + 80 - 81
= 125 - 81
= 44
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a: M=-2021+2021-68-68+17
=-119
b: B=(-1)+(-1)+...+(-1)
=-1x500
=-500
c: C=(1-2-3+4)+(5-6-7+8)+...+(997-998-999+1000)
=0
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có: \(2011+5\left[300-\left(17-7\right)^2\right]\)
\(=2011+5\left[300-10^2\right]\)
\(=2011+1000=3011\)
\(2011+5.\left[300-\left(17-7\right)^2\right]\)
\(=2011+5.\left[300-\left(10\right)^2\right]\)
\(=2011+5.\left[300-100\right]\)
\(=2011+5.200\)
\(=2011+1000\)
\(=3011\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a: \(=2011+5\cdot\left[300-10^2\right]\)
\(=2011+5\cdot200\)
=1011
b: \(=695-\left[200+10^2\right]\)
=695-300
=395
a) =2011+5.200
=3011
b)=695-300
=395
c)1=29-5.4
=109
d)=2010-2000:400
=2010-5
=2005
![](https://rs.olm.vn/images/avt/0.png?1311)
e) 2011 + 5[300 – (17 – 7)2 ]
= 2011 + 5[300 - 100]
= 2011 + 5 . 200
= 2011 + 1000
= 3011
=2011+5[300-10^2]
=2011+5[300-100]
=2011+5*200
=2011+1000
=3011
![](https://rs.olm.vn/images/avt/0.png?1311)
2011 + 5.[300 - (17 - 7)2]
= 2011 + 5.(300 - 102)
= 2011 + 5.(300 - 100)
= 2011 + 5.200
= 2011 + 1000
= 3011
bạn gặp đúng người đấy.Kết quả đúng nhất là 3011,nếu sai mình chịu gì cũng được
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 12 : { 400 : [500 – (125 + 25 . 7)]}
=12 : { 400 : [500 – (125 + 175)]}
=12 : [ 400 : [500 – 300)]
=12 : (400:200)
=12:2=6
b) 5 . 22 – 18 : 3
=5.4-6
=20-6=14
c) 18 : 3 + 182 + 3.(51 : 17)
=5+182+3.3
=187+9=196
d) 25 . 8 – 12.5 + 170 : 17 – 8
=200-60+10-8
=142
e) 2.52+ 3: 710 – 54: 33
=2.25+3:1-54:27
=50+3-2
=51
f) 189 + 73 + 211 + 127
=(189+211)+(73+127)
=400+200=600
g) 375 : {32 – [ 4 + (5. 32– 42)]} – 14 )
=375 : {32 – [ 4 + (160– 42)]} – 14 )
=375 : [32 – ( 4 + 118) – 14 ]
=375:(32-122-14)
=375:-104
=-375/104
h) (52022 + 52021) : 52021
=(52022:52021)+(52021:52021)
=5+1=6
\(2021+5\left[300-\left(17-7\right)^2\right]\)
\(=2021+5\left[300-10^2\right]\)
\(=2021+5\left[300-100\right]\)
\(=2021+5\cdot200\)
\(=2021+1000=3021\)
b) 2021 + 5 [300 - (17 - 7)2]
= 2021 + 5 [ 300 - 102]
= 2021 + 5 [ 300 - 100]
= 2021 + 5 . 200
= 2021 + 1000
= 3021