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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 -
2009,5 hoac 4019/2.
k cho minh nhe.Minh cung thich ziippo lam. Xong roi ket ban nhe.
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
\(2010-2000:\left[486-2\left(7^2-6\right)\right]\)
\(=2010-2000:\left[486-2\left(49-6\right)\right]\)
\(=2010-2000:\left(486-2\cdot43\right)\)
\(=2010-2000:\left(486-86\right)\)
\(=2010-2000:400\)
\(=2010-5\)
\(=2005\)
`2010-2000:[486-2(7^2-6)]`
`=2010-2000:[486-2.(49-6)]`
`=2010-2000:(486-2.43)`
`=2010-2000:(486-86)`
`=2010-2000:400`
`=2010-5=2005`
\(2010-2000:\left[486-2\left(7^2-6\right)\right]\)
=2010-2000:[486-2*43]
=2010-2000:400
=2010-5=2005
Cách 1 :
2010 - 2000/486 - 2(7^2 x 6)
= 5/51
Cách 2 :
2010 - 2000/486 - 2 ( 7^2 x 6 )
= 2029 , 607 843 137 25
k cho mk nha
\(2010-2000:\left[486-2.\left(7^2-6\right)\right]\)
\(=2010-2000:\left[486-2.\left(49-6\right)\right]\)
\(=2010-2000:\left[486-2.43\right]\)
\(=2010-2000:\left[486-86\right]\)
\(=2010-2000:400\)
\(=2010-5\)
\(=2005\)
\(500-\left\{5.\left[409-\left(2^3:3-21\right)^2\right]+10^3\right\}.15\)
\(=500-\left\{5.\left[409-\left(8:3-21\right)^2\right]+10^3\right\}.15\)
\(=500-\left\{5.\left[409-\left(\frac{8}{3}-21\right)^2\right]+10^3\right\}.15\)
\(=500-\left\{5.\left[409-\frac{-55}{3}\right]+1000\right\}.15\)
\(=500-\left\{5.\left(\frac{1282}{3}\right)+1000\right\}.15\)
\(=500-\left\{\frac{6410}{3}+1000\right\}.15\)
\(=500-\frac{9410}{3}.15\)
\(=500-47050\)
\(=-46550\)
\(2010-2000:\left[486-2\left(7^2-6\right)\right]\)
\(=2010-2000:\left[486-2\left(49-6\right)\right]\)
\(=2010-2000:\left[486-2.43\right]\)
\(=2010-2000:\left[486-86\right]\)
\(=2010-2000:400\)
\(=2010-5\)
\(=2005\)
2012 - 2000 : [ 486 - 2(7^2-6)]
=2012 - 2000 : [486 - 2(49-6)]
=2012 -2000 : [486-2*43]
=2012 - 2000 :[486-86]
=2012-2000:100
=2012 - 20
=1992