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a 475 - ( 75 + 36 ) = 475 - 75 - 36
= 400 - 36
= 364
b 821 - 73 - 27 - 21
= ( 821 - 21 ) - ( 73 + 27 )
= 800 - 100
= 700
a ) 475 - ( 75 + 36 )
= 475 - ( 75 + 35 ) - 1
= ( 475 - 1 ) - 100
= 474 - 100 = 374
b ) 821 - 73 - 27 - 21
= ( 821 - 21 ) - ( 73 + 27 )
= 800 - 100
= 700
c ) \(\frac{37}{25}\div\frac{5}{4}\div\frac{74}{25}\)
\(=\frac{37\cdot2\cdot2\cdot25}{25\cdot5\cdot37\cdot2}\)
\(=\frac{2}{5}\)
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tong moi cua 2 kho thoc la 475 - 25 - 50 = 400
ta co so do :kho A:|.......|.......|.......|
kho B |.......|.......| tong la 400(gap ruoi la 3/2)
tong so phan la 3 + 2 = 5(phan)
kho A luc dau co so tan thoc la: 400 / 5 x 3 +25 =265(tan) CHUC BAN HOC GIOI!
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9 km 475 m = 9, 475 km
25kg 62 g = 25,062kg
1 phút 48 giây = 108 phút
42 m² 7dm² =42,07 m²
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a) 1 5 + 2 5 = 1 + 2 5 = 3 5
b) 3 × 1 2 = 3 × 1 2 = 3 2
c) 1 - 2 3 + 1 6 = 1 - 12 18 + 3 18 = 1 - 15 18 = 3 18 = 1 6
d) 1 1 5 ÷ 1 1 2 = 6 5 ÷ 3 2 = 12 15 = 4 5
e) 3 5 + 2 5 × 1 6 = 3 5 + 2 30 = 20 30 = 2 3
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 1 5 + 2 5 = 1 + 2 5 = 3 5
b) 3 × 1 2 = 3 × 1 2 = 3 2
c) 1 - 2 3 + 1 6 = 1 - 12 18 + 3 18 = 1 - 15 18 = 3 18 = 1 6
d) 1 1 5 ÷ 1 1 2 = 6 5 ÷ 3 2 = 12 15
e) 3 5 + 2 5 × 1 6 = 3 5 + 2 30 = 20 30 = 2 3
![](https://rs.olm.vn/images/avt/0.png?1311)
`3+4/9xx7/25xx27/12xx3 4/7-7/25`
`=3+4/9xx7/25xx27/12xx25/7-7/25`
`=3+7/25xx25/7xx4/9xx27/12-7/25`
`=3+4/9xx9/4xx1-7/25`
`=3+1xx1-7/25`
`=3+1-7/25`
`=75/25+25/25-7/25`
`=93/25`
\(M=3+\dfrac{4}{9}\times\dfrac{7}{25}\times\dfrac{27}{12}\times3\dfrac{4}{7}-\dfrac{7}{25}\)
\(=3+\dfrac{4}{9}\times\dfrac{7}{25}\times\dfrac{27}{12}\times\dfrac{25}{7}-\dfrac{7}{25}\)
\(=3+\left(\dfrac{4}{9}\times\dfrac{27}{12}\right)\times\left(\dfrac{7}{25}\times\dfrac{25}{7}\right)-\dfrac{7}{25}\)
\(=3+\left(\dfrac{4\times3\times9}{9\times3\times4}\right)\times1-\dfrac{7}{25}\)
\(=3+1\times1-\dfrac{7}{25}\)
\(=3+1-\dfrac{7}{25}\)
\(=4-\dfrac{7}{25}\)
\(=\dfrac{100}{25}-\dfrac{7}{25}\)
\(=\dfrac{93}{25}\)
125 . 12 . 80
= ( 125 . 80 ) . 12
= 10000 . 12
= 120000
2975 : 25 - 475 : 25
= ( 2975 - 475 ) : 25
= 2500 : 25
= 100