câu a =3000

a, 28(231+69)+72(231+69)                  

=231+69.(28+72)

=231+69.100

=231+6900

=7131

b, 39(250+87)+64(240+97)

=39.337+64.337

=337(39+64)

=337.103

=34711

1) 12.2.25+29.25+59.25

=24.25+29.25+59.25

=25(24+29+59)

=25.112

=2800

2) 25.(231+69)+72.(231+69)

=25.300+72.300

=300(25+72)

=300.97

=29100

3) 39.(250+87)+64.(240+97)

=39.337+64.337

=337.(39+64)

=337.103

=34711

4) 36.28+36.82+64.69+64.41

=36.(28+82)+64.(69+41)

=36.110+64.110

=110(36+64)

=110.100

=11000

Đăng từng bài thôi nha bạn.

12 x 2 x 25 + 29 x 25 + 59 x 25 = 2800

25 x  ( 231 + 69 ) + 72 x ( 231 + 69 ) = 29100

39 x ( 250 + 87 ) + 64 x ( 240 + 97 ) = 34711

 36 x 28 + 36 x 82 + 64 x 69 + 64 x 41 = 11000

Cho mik xin đúng nhá

1) 12 x 2 x 25 + 29 x 25 + 59 x 25

= 24 x 25 + 29 x 25 + 59 x 25

= 25 x ( 24 + 29 + 59 )

= 25 x 112

= 2800

2) 25 x ( 231 + 69 ) + 72 x ( 231 + 69 )

= 25 x 300 + 72 x 300

= ( 25 + 72 ) x 300 

= 29100

3)39 x ( 250 + 87 ) + 64 x ( 240 + 97 )

= 39 x 337 + 64 x 337

= ( 39 + 64 ) x 337

= 103 x 337

= 34711

tính nhanh 

1) 12.2.25+29.25+59.25

2) 25.(231+69)+72.(231+69)

3) 39.(250+87)+64.(240+97)

4) 36.28+36.82+64.69+64.41

1) 12 x 2 x 25 + 29 x 25 + 59 x 25

= 24 x 25 + 29 x 25 + 59 x 25

= 25 x ( 24 + 29 + 59 )

= 25 x 112

= 2800

2) 25 x ( 231 + 69 ) + 72 x ( 231 + 69 )

= 25 x 300 + 72 x 300

= ( 25 + 72 ) x 300 

= 29100

3)39 x ( 250 + 87 ) + 64 x ( 240 + 97 )

= 39 x 337 + 64 x 337

= ( 39 + 64 ) x 337

= 103 x 337

= 34711

1) 12 x 2 x 25 + 29 x 25 + 59 x 25

= 24 x 25 + 29 x 25 + 59 x 25

= 25 x ( 24 + 29 + 59 )

= 25 x 112

= 2800

2) 25 x ( 231 + 69 ) + 72 x ( 231 + 69 )

= 25 x 300 + 72 x 300

= ( 25 + 72 ) x 300 

= 29100

3)39 x ( 250 + 87 ) + 64 x ( 240 + 97 )

= 39 x 337 + 64 x 337

= ( 39 + 64 ) x 337

= 103 x 337

= 34711

= 39 . 337 + 61 . 337

= 337. ( 39+61)

= 337 . 100 = 33700

\(39\times\left(250+87\right)+61\times\left(240+97\right)\)

\(=337\times\left(39+61\right)\)

\(=337\times100\)

\(=33700\)

\(39\cdot\left(250+87\right)+61\cdot\left(240+97\right)\)

\(=39\cdot337+61\cdot337\)

\(=337\cdot\left(39+61\right)\)

\(=337\cdot100\)

\(=33700\)

33700

39.(250+87)+61.(240+97)

=39.337+61.337

=(39+61).337

=100.337

=33700

-2017

-26914

480

-450

1) - 135 - 2017 + 9 x 15

= - 135 - 2017 + 135

= ( - 135 + 135 ) - 2017

= 0 - 2017

= - 2017

2) - 39 x ( 250 - 87 ) - 61 x ( 240 + 97 )

= - 39 x 163 - 61 x 337

= - 6357 - 20557

= - 26914

3) 65 + 135 - 35 + 9 x 35

= 65 + 135 - 35 + 315

= ( 65 + 315 ) + ( 135 - 35 )

= 380 + 100

= 480

4) - 15 x ( 23 + 157 ) + 15 x 157 - 15 x 7

= 15 x ( - 180 ) + 15 x 157 - 15 x 7 

= 15 x ( - 180 + 157 - 7 )

= 15 x ( - 30 )

= - 450

39x[250+87]+64x[240+97]

=39x337+64x337

=(39+64)x337

=103x337

=34711

78x31+78x24+78x17-22x72

=78x(31+24+17)-22x72

=78x72-22x72

=(78-22)x72

=56x72

=4032

bn tính lại nha

39 x [ 250 + 87 ] + 64 x [ 240 + 97 ]

= 39 x 337 + 64 x 337

= 337 x ( 39 + 64 )

= 337 x 103

= 34711

bai tiep

78 x 31 + 78 x 24 +78  x  17 - 22 

= 78 x  ( 31 + 24 + 17 ) - 22 x 72

= 78 x  72 - 22 x 72

=72 x  ( 72 - 22 )

= 72 x 50

= 3600