a, 28(231+69)+72(231+69) b, 39(250+87)+64(240+97)
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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) \(39.\left(250+87\right)+61\left(240+97\right)=39.337+61.337\)
\(=337.\left(39+61\right)=337.100=33700\)
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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
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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
![](https://rs.olm.vn/images/avt/0.png?1311)
\(28\cdot\left(231+69\right)+72\cdot\left(60+240\right)\)
\(=28\cdot300+72\cdot300\)
\(=300\cdot\left(28+72\right)\)
\(=300\cdot100=30000\)
![](https://rs.olm.vn/images/avt/0.png?1311)
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
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28.(231 + 69) +72. (231 + 69 )
=28. 300 +72. 300
= 300.(28+72)
= 300. 100
=30000
KB nha!!!
![](https://rs.olm.vn/images/avt/0.png?1311)
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!
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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, \(79.101=79.\left(100+1\right)=79.100+79=7900+79=7979\)
![](https://rs.olm.vn/images/avt/0.png?1311)
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
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