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bài 1 : 26,75 + (8232 : 84 - 68,5) x 11
=26,75 + 29,5 x 11
= 26,75 + 324,5
= 351,25
bài 2 : 2007 x 1,0001 + 2008 x 1,0001 + 2009 x 1,0001
= (2007 + 2008 + 2009 ) x 1,0001
= 6024 x 1,0001
![](https://rs.olm.vn/images/avt/0.png?1311)
2007,2007 + 2008,2008 + 2009,2009
= ( 2007,2007 + 1,0001 ) + 2008,2008 + ( 2009,2009 - 1,0001 )
= 2008,2008 + 2008,2008 + 2008,2008
= 2008,2008 x 3
= 6024,6024
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132 + 77 + 198
= 11 x 12 + 11 x 7 + 11 x 18
= 11 x (12 + 7 + 18) ( nhân 1 số với 1 tổng)
= 11 x 37
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5555 + 6767 + 7878
= 55 x 101 + 67 x 101 + 78 x 101
= (55 + 67 + 78) x 101
= 200 x 101
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1997, 1997 + 1998, 1998 + 1999, 1999
= 1997 x 1,0001 + 1998 x 1,0001 + 1999 x 1,0001
= (1997 + 1998 + 1999) x 1,0001
= 5994 x 1,0001 ( nhân 1 tổng với 1 số)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
= 2007 x 1,0001 + 2008 x 1,0001 + 2009 x 1,0001
= 1,0001 x ( 2007 + 2008 + 2009 )
= 1,0001 x 6024
![](https://rs.olm.vn/images/avt/0.png?1311)
2007,2007+2008,2008+2009,2009
=2007 x 1,0001+ 2008 x 1,0001 + 2009 x 1,0001
= 1,0001 x (2007+2008+2009)
=1,0001 x 6024