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=(25.4).(12.30) =100.360=36000 ;nho **** cho minh nhe !
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1/
25x12x30x4
= (25x4)x(12x30)
=100x3600
=360 000
2/
23+23x2+23x3+23x4
=23x1+23x2+23x3+23x4
=23x(1+2+3+4)
=23x10
=230
3/
248x2005 - 2005x148
=(248-148)x2005
=100x2005
=200500
1/
25x12x30x4
= (25x4)x(12x30)
=100x3600
=360 000
2/
23+23x2+23x3+23x4
=23x1+23x2+23x3+23x4
=23x(1+2+3+4)
=23x10
=230
3/
248x2005 - 2005x148
=(248-148)x2005
=100x2005
=200500
![](https://rs.olm.vn/images/avt/0.png?1311)
\(108\times5+108\times96-108=108\times\left(5+96-1\right)\)
\(=108\times100=10800\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a)23+23*2+23*3+23*4
=23*(1+2+3+4)
=23*10
=230
b)246*2005-2005*148+2005*2
=(246-148+2)*2005
=100*2005
=200500
c)25*12*30*4
=(25*4)*(12*30)
=100*360
=36000
Câu d làm tương tự câu b
![](https://rs.olm.vn/images/avt/0.png?1311)
25 x 12 x 30 x 4 = (25 x 4) x (12 x 30)
= 100 x 360
= 36000
25 x 12 x 30 x 4 = ( 25 x 4 x 10 ) x 12 x 3
= 1000 x 36
= 36 000