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5555 + 6767 + 7878
= 55 x 101 + 67 x 101 + 78 x 101
= (55 + 67 + 78) x 101
= 200 x 101
![](https://rs.olm.vn/images/avt/0.png?1311)
5555 + 6767 +7878
= 55 x101 +67x101 + 78x 101
= 101 x( 55 + 6 7 +78 )
=101 x 200
= 55 * 11 + 67 * 11 + 78 * 11
= 101 * ( 55 + 67 + 78 )
= 101 * 200
= 20200
![](https://rs.olm.vn/images/avt/0.png?1311)
Tính nhanh:
a) 132 + 77 + 198
= ( 100 + 32 ) + ( 70 + 7 ) + 198
= (198 + 32 ) + ( 100 + 70 ) + 7
= 230 + 170 +7
= 400 +7
= 407
Ủng hộ nha! :)
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a, 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
b, 5555 + 6767 + 7878
= 55 x 101 + 67 x 101 + 78 x 101
= 55 + 67 + 78) x 101
= 200 x 101
c, 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)
a, 132 + 77 + 198 = 12.11 + 7.11 + 18.11 = 11.( 12 + 7 + 18 ) = 11.37
b, 5555 + 6767 + 7878 = 55.101 + 67.101 + 78.101 = 101.( 55 + 67 + 78 ) = 101.200
a) 132 +77+198
= 11 x 12+11 x 7 + 11 x 18
= 11 x ( 12 + 7 +18 )
= 11 x 37
b) 5555 + 6767 +7878
= 101 x 55 + 101 x 67 + 101 x 78
= 101 x ( 55 + 67 + 78 )
= 101 x 200
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 132 + 77 + 198
= 11 x 12 + 11 x 7 + 11 x 18
= 11 x ( 12 + 7 + 18 )
= 11 x 37
b) 5555 + 6767 + 7878
= 55 x 101 + 67 x 101 + 78 x 101
= ( 55 + 67 + 78 ) x 101
= 200 x 101
c) 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.
a) 132 + 77 + 198
= 11 x 12 + 11 x 7 + 11 x 18
= 11 x ( 12 + 7 + 18 )
= 11 x 37
b) 5555 + 6767 + 7878
= 55 x 101 + 67 x 101 + 78 x 101
= ( 55 + 67 + 78 ) x 101
= 200 x 101
c) 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.