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( 81 x 70 - 2013 ) x ( 92 x 86 - 46 x 172 )
=( 5670 -2013 ) x ( 7912 - 7912 )
=3657 x 0
= 0
( 81 × 70 - 2013 ) × ( 92 × 86 - 46 × 172 )
= ( 5670 - 2013 ) × ( 7912 - 7912 )
= 3675 × 0
= 0
Chúc bạn học giỏi nha !!!
![](https://rs.olm.vn/images/avt/0.png?1311)
* 4 x 1930 x 3 + 6 x 70 x 2
= (4 x 3 ) x 1930 + (6 x 2 ) x 70
= 12 x 1930 + 12 x 70
= 12 x (1930 + 70 )
= 12 x 2000
= 24000
* 8 x 427 x 3 + 6 x 573 x 4
= ( 8 x 3 ) x 427 + (6 x 4 ) x 573
= 24 x 427 + 24 x 573
= 24 x ( 427 + 573 )
= 24 x 1000
= 24000
* 117x (35 + 46 ) - 17 x (35 + 46 )
= ( 117 - 17 ) x ( 35 + 46 )
= 100 x 81
= 8100
![](https://rs.olm.vn/images/avt/0.png?1311)
Lượng nước nặng:
3.5*92% = 3.22(kg)
Lượng dưa nặng :
3.5-3.22=0.28 (kg)
Lúc sau lượng dưa chiếm:
100%-86%=14%(quả dưa lúc đó)
Quả dưa lúc sau nặng :
0.28/14% = 2(kg)
lượng nước nặng: 3.5*92% = 3.22(kg)
lượng dưa nặng :3.5-3.22=0.28 (kg)
lúc sau lượng dưa chiếm: 100%-86%=14%(quả dưa lúc đó)
quả dưa lúc sau nặng : 0.28/14% = 2(kg)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(37\times46+37\times51+111\)
\(=37\times46+37\times51+37\times3\)
\(=37\times\left(46+51+3\right)\)
\(=37\times100\)
\(=3700\)
------------
\(172\times47+86\times8-34\times4\)
\(=172\times47+172\times4-34\times4\)
\(=172\times\left(47+4\right)-34\times4\)
\(=172\times51-34\times4\)
\(=172\times3\times17-17\times2\times4\)
\(=17\times\left(172\times3-2\times4\right)\)
\(=17\times\left(516-8\right)\)
\(=17\times508\)
\(=8636\)
------------
\(35\times215-35\times200-175\)
\(=35\times215-35\times200-35\times5\)
\(=35\times\left(215-200-5\right)\)
\(=35\times10\)
\(=350\)
------------
\(48\times56+28\times104\)
\(=48\times2\times28+28\times104\)
\(=28\times\left(48\times2+104\right)\)
\(=28\times200\)
\(=5600\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(37\times46+37\times51+111\)
\(=37\times46+37\times51+37\times3\)
\(=37\times\left(46+51+3\right)\)
\(=37\times100\)
\(=3700\)
b) \(35\times215-35\times210-175\)
\(=35\times215-35\times210-35\times5\)
\(=35\times\left(215-210-5\right)\)
\(=35\times0\)
\(=0\)
c) \(172\times47+86\times8-34\times4\)
\(=4\times\left(43\times47+86\times2-34\right)\)
\(=4\times\left(2021+172-34\right)\)
\(=4\times2159\)
\(=8636\)
d) \(48\times56+28\times104\)
\(=48\times56+56\times52\)
\(=56\times\left(48+52\right)\)
\(=56\times100\)
\(=5600\)
![](https://rs.olm.vn/images/avt/0.png?1311)
= \(\left(\frac{63}{61}-\frac{2}{61}\right)\)+ \(\left(\frac{56}{97}-\frac{56}{97}\right)\)
= 1 + 0
= 1
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 32,6 + 2,67=35.27
b) 70 - 32,56=37.44
c) 70,7 x 3,25=229.775
d) 4695,6 : 86=54.6
[ 61 x 70 - 2013] x [92 x 86 - 46 x 172]
= [4270 - 2013] x [92 x 86 - 46 x 86 x 2]
= 2257 x [92 x 86 - 92 x 86]
= 2257 x [(92 - 92) x 86]
= 2257 x [0 x 86]
= 2257 x 0
= 0