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a) 2010 - 2000 : [486 - 2(72 - 6)]
= 2010 - 2000 : [486 - 2(49 - 6)]
= 2010 - 2000 : [486 - 2 . 43]
= 2010 - 2000 : [486 - 86]
= 2010 - 2000 : 400
= 2010 - 5
= 2005
b) 2345 - 1000 : [19 - 2(21 - 18)2 ]
= 2345 - 1000 : [19 - 2 . 32 ]
= 2345 - 1000 : [19 - 18]
= 2345 - 1000 : 1
= 2345 - 1000
= 1345
c) 128 - [68 + 8(37 - 35)2 ] : 4
= 128 - [68 + 8 . 22 ] : 4
= 128 - [68 + 32 ] : 4
= 128 - 100 : 4
= 128 - 25
= 103
d) 568 - {5[143 - (4 - 1)2 ] + 10} : 10
= 568 - {5[143 - 9 ] + 10} : 10
= 568 - {5 . 134 + 10 } : 10
= 658 - {670 + 10 } : 10
= 658 - 680 : 10
= 658 - 68
= 590
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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
300 : 60 - 30 : (10 + 5) - 30
= 50 - 30 : 15 - 30
= 50 - 2 - 30
= 48 - 30
= 18.
2011 + 5 . [300 - 10 . (17 - 7)]
= 2011 + 5 . [300 - 10 . 10]
= 2011 + 5 . [300 - 100]
= 2011 + 5 . 200
= 2011 + 1000
= 3011.
29 - [16 + 3 . (51 - 49)]
= 29 - [16 + 3 . 2]
= 29 - [16 + 6]
= 29 - 22
= 7.
2010 - 2000 : [486 - 2 . (49 - 6)]
= 2010 - 2000 : [486 - 2 . 43]
= 2010 - 2000 : [486 - 86]
= 2010 - 2000 : 400
= 2010 - 500
= 1510.
cái câu 300 :60 - 30 ; ( 10 + 5 ) - 30 Nguyễn Thanh vân sai rồi tề, đáng lẽ 300 : 60 = 5 chớ
2010 - 2000 : [ 486 - 2( 72 - 6 ) ]
= 2010 - 2000 : [ 486 - 2( 49 - 6 )]
= 2010 - 2000 : [ 486 - 2. 43 ]
= 2010 - 2000 : [ 486 - 86 ]
= 2010 - 2000 : 400
= 2010 - 5
= 2005.
2010-2000:\([\)486-2(72-6)\(]\)=2010-2000:\([\)486-86\(]\)
=2010-2000:400
=2010-5=2005
a: \(2\cdot25\cdot4\cdot50\)
\(=\left(2\cdot50\right)\cdot\left(25\cdot4\right)\)
\(=100\cdot100=10000\)
b: \(\left(-125\right)\cdot5\cdot\left(-16\right)\cdot\left(-8\right)\)
\(=-125\cdot5\cdot16\cdot8\)
\(=-\left(125\cdot8\right)\cdot\left(5\cdot16\right)\)
\(=-80\cdot1000=-80000\)
c: \(5^2\cdot3^3\cdot2\)
\(=25\cdot27\cdot2\)
\(=\left(25\cdot2\right)\cdot27=27\cdot50=1350\)
d: \(\left(-4\right)\cdot3^2\left(-5\right)^3\)
\(=\left(-4\right)\cdot\left(-125\right)\cdot9\)
\(=500\cdot9=4500\)
a. 84 : 4 + 39 : 37 + 50
= 21 + 32 + 1
= 21 + 9 + 1
= 21 + 10 = 31
b. 2010 - 2000 : [ 486 - 2.(72 - 6) ]
= 2010 - 2000 : [ 486 - 2.(49 - 6) ]
= 2010 - 2000 : ( 486 - 2.43 )
= 2010 - 2000 : ( 486 - 86 )
= 2010 - 2000 : 400
= 2010 - 5
= 2005
c. 62 - 120 + (-5) - |-5|
= 36 - 120 - 5 - 5
= 36 -