59*267-67*31-67*28

59*267(67*31-67*280)

59*267-67*(61+28)

59*267-67*59

59*(267-67)

59*200

=11800

\(59.267-67.31-67.28\)

\(=59.267-\left(67.31+67.28\right)\)

\(=59.267-\left[67.\left(31+28\right)\right]\)

\(=59.267-\left[67.59\right]\)

\(=59.267-67.59\)

\(=59.\left(267-67\right)\)

\(=59.200\)

\(=11800\)

~ Hok tốt ~

= 59 . 267 - (67 . 31 + 67 . 28 )

= 59 . 267 - [ 67 . ( 31 + 28 ) ]

= 59 . 267 - [ 67 . 59 ]

= 59 . 267 - 67 . 59

= 59 . ( 267 - 67 )

= 59 . 200

= 11800

                                   #Tề _ Thiên

a) 491 x (267+53) - 491 x ( 153 + 67 )

=491x<(267+53) - (153+67)>

=491x<300-200>

=491x100

=49100

b) 53 x 39 + 47 x 39 - 53 x 21 - 47 x 21 

=53x(39-21) - 47x(39-21)

=53x18-47x18

=18x(53-47)

=18x6

=108

bạn ơi cho mình sửa phần b) nha

b) 53 x 39 + 47 x 39 - 53 x 21 - 47 x 21 

=53x(39-21) + 47x(39-21)

=53x18+47x18

=18x(53+47)

=18x100

=1800

a) 491×(267+53)-491×(153+67)=491×320-490×220=491×(320-220)=491×100=49100.

b) 53×39+47×39-53×21-47×21=(53×39-53×21)+(47×39-47×21)=[53×(39-21)]+[47×(39-21)]=53×18+47×18=(53+47)×18=100×18=1800.

a) 1 267 + 99 + 501 = 1 267 + (99 + 501)

                                = 1 267 + 600 = 1 867

     25 x 14 x 4 = (25 x 4) x 14

                       = 100 x 14 = 1 400

b) 3 905 x (50 – 1) = 3 905 x 50 – 3 905 x 1

                             = 195 250 – 3 905 = 191 345

     270 : ( 27 x 2 ) = 270 : 27 : 2

                             = 10 : 2 = 5

c) 115 x 58 + 115 x 42 = 115 x (58 + 42)

                                   = 115 x 100 = 11 500

136 x 67 – 136 x 66 = 136 x (67 – 66)

                              = 136 x 1 = 136

\(491.\left(267+53\right)-491.\left(153+67\right)\)

\(=491.\left[267+53-125-67\right]\)

\(=491.100=49100\)

491.(267+53)-491.(153+67)=491.(267+53-153-67)=491.100=49100

a, 132 x 99 + 132 

= 132 x 99 + 132 x 1

= 132 x ( 99 + 1 )

= 132 x 100 = 13200

b, ( 56 x 27 + 56 x 35 ) : 62 

= 56 x ( 27 + 35 ) : 62

= 56 x 62 : 62

= 62 : 62 x 56

= 1 x 56 = 56

c, 2015 x ( 67 + 53 ) - 2005 x ( 53 + 67 )

= 2005 + 10 x 120 - 2005 x 120

= 2005 x 120 - 2005 x 120 + 10

= 2005 x ( 120 - 120 ) + 10

= 2005 x 0 + 10

= 0 + 10 = 10

d, 2009 x 2009 - 2010 x 2008 

= 2009 x 2009 - 2009 x 2009

= 2009 x ( 2009 - 2009 )

= 2009 x 0

= 0

e, 4357 x 267 x ( 630 - 315 x 2 )

= 4357 x 267 x ( 630 - 630 )

= 4357 x 267 x 0

= 4357 x 0

= 0

a. 132 x 99 + 132 

= 132 x (99 + 1) 

= 132 x 100

= 13200

b. (56 x 27 + 56 x 35) : 62

= 56 x (27 + 35) : 62

= 56 x 62 : 62

= 56

c. 2015 x (67 + 53) - 2005 x (53 + 67)

= (2015 - 2005) x (67 + 53)

= 2010 x 120

= 241200

a, 132 x 99 + 132 

= 132 x 99 + 132 x 1

= 132 x ( 99 + 1 )

= 132 x 100 = 13200

b, ( 56 x 27 + 56 x 35 ) : 62 

= 56 x ( 27 + 35 ) : 62

= 56 x 62 : 62

= 62 : 62 x 56

= 1 x 56 = 56

c, 2015 x ( 67 + 53 ) - 2005 x ( 53 + 67 )

= 2005 + 10 x 120 - 2005 x 120

= 2005 x 120 - 2005 x 120 + 10

= 2005 x ( 120 - 120 ) + 10

= 2005 x 0 + 10

= 0 + 10 = 10

d, 2009 x 2009 - 2010 x 2008 

= 2009 x 2009 - 2009 x 2009

= 2009 x ( 2009 - 2009 )

= 2009 x 0

= 0

e, 4357 x 267 x ( 630 - 315 x 2 )

= 4357 x 267 x ( 630 - 630 )

= 4357 x 267 x 0

= 4357 x 0

= 0

491.(267+53) + 491.(151+67) = 491.(267+53+151+67)

                                                = 491 . 538

                                                = 264158

 253 - (-76 + 253) + 99 =175

68 - (199 + 68) - (-150) = -49

211 - (107 + 211) - 23 = -130

-(-345 + 56 - 267) + (453 - 124 - 843) =42

-25 - (34 - 256 + 67) - (-2) + (-10 - 65) =57.

a) 93.85+17.45-170=8500

b) 491.(267+53) -491. (153+67) =49100

c) 45.48-90.24+145=145

d) 754.75-2262.25+4568=4568

e) 23.157+15.46 -23.87=2300

không trả lời linh tinh

= a) 93.85+17.45-170 

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