a) \(28.\left(231+69\right)+72.\left(169+31\right)=28.300+72.200\)

\(=100.\left(28.3+72.2\right)=100.\left(84+144\right)=100.228=22800\)

b) \(39.\left(250+87\right)+61\left(240+97\right)=39.337+61.337\)

\(=337.\left(39+61\right)=337.100=33700\)

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

\(=28.300+72.300\)

\(=300.\left(28+72\right)\)

\(=300.100=30000\)

\(28\cdot\left(231+69\right)+72\cdot\left(60+240\right)\)

\(=28\cdot300+72\cdot300\)

\(=300\cdot\left(28+72\right)\)

\(=300\cdot100=30000\)

28.(231+69)+72.(60+240)

=28.300+72.300

=300.(28+72)

=300.100

=30000

   28  .  ( 231  +  69 )  +  72  .  ( 231  +  69 )

= ( 231  +  69 )  .  ( 72  +  28 )

= 300  .  100

= 30000

=28.231+28.69+72.231+72.69

=28.231+72.231+28.69+72.69

=231.(72+28)+69.(28+72)

=231.100+69.100

=32100+6900

=39000

28+72.(213+69)=100.282=28200

\(=30000\)

đúng thì k nha

  28.(231 + 69) +72. (231 + 69 )

=28.   300       +72.     300

= 300.(28+72)

= 300.  100

=30000

KB nha!!!

28.(231+69)+72.(231+69)=

28.231+28.69+72.231+72.69=

(28+72).231+(28+72).69=

100.231+100.69=

100.(231+69)=

100.300=30000

Tính nhanh  

28.(231+69) +72(231+69)

= 28 x 300 + 72 x 300

= (28+72) x 300

= 100 x 300

= 30000

#Học tốt!

Chúc bn ngày mới vui vẻ!

a.12.25+29.25+59.25

=(12+29+59).25

=100.25

=2500

b.28(231+69)+72(231+69)

=(28+72).(231+69)

=100.300

=30000

mình chỉ biết giải 2 bài trên thôi còn 2 bài dưới theo mình là tính thường đấy

a, \(12.25+29.25+59.25\)

\(=25.\left(12+29+59\right)=25.100=2500\)

b, \(28.\left(231+69\right)+72.\left(231+69\right)\)

\(=300.\left(28+72\right)=300.100=30000\)

c, \(53.11+75.11\)

\(=11.\left(53+75\right)=1408\)

d, \(79.101=79.\left(100+1\right)=79.100+79=7900+79=7979\)

a.12.25+29.25+59.25

=(12+29+59).25

=100.25=2500

b.28(231+69)+72(231+69)

=(28+72).(231+69)

=100.300=30000

bài c và d thì mình ko hiểu đề

a)25.(12+29+59)=25.100=2500

b)(231+69)(28+72)=300.100=30000

c)27(49+51)+27=27.100+27=2700+27=2727

d)là sao ko hiểu nếu là phân số bằng

583/7979

a. = 25.(12+29+59) = 25.100 = 2500

b. = 28.300 + 72.300 = 300.100 = 30000

c. = 27.(49+51+1) = 27.101 = 2727

d. 53.11 = 583

    79.101 = 7979

a,12*25+29*25+59*25

=25(12+29+59)

=25*100

=2500

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

=(231+69)(28+72)

=300*100

=30000

c,49*27+51*27+27

=27(49+51)+27

=27*100+27

=2700+27

=2727

d,53*11

=53*10+53*1

=530+53

=583

79*101

=79*100+79*1

=7900+79

=7979