Tính bằng cách thuận tiện nhất:
64 x 867 + 867 x 36 – 30 x 867 = ...........
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64 x 867 + 867 x 36 - 30 x 867
= 867 x ( 64 + 36 - 30 )
= 867 x 70
= 60 690
\(64\times867+867\times36-30\times867\)
\(=867\times\left(64+24-30\right)\)
\(=867\times70\)
\(=60690\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a,2009x867+2009x133=2009x(867+133)=2009x1000=2009000
b,có vẻ sai đề.
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1994x867+1995x133
=1994x867+1994x133+133
=1994x(867+133)+133
=1994x1000+133
=1994000+133
=1994133
=1994*867+(1994+1)*133
=1994*867+1994*133+133=1994*(867+133)+133
=1994*1000+133=1994000+133
=1994133
![](https://rs.olm.vn/images/avt/0.png?1311)
\(1994x867+1995x133\)
\(=1994x867+\left(1994+1\right)x133\)
\(=1994x867+1994x133+133\)
\(=1994x\left(867+133\right)+133\)
\(=1994x1000+133\)
\(=1994000+133\)
\(=1994333\)
Chúc bạn học tốt !!!!
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c ) 815 - 23 - 77 + 185
= ( 815 + 185 ) - ( 23 + 77 )
= 1000 - 100 = 900
m ) 8 x 427 x 3 + 6 x 573 x 4
= 24 x 427 + 24 x 573
= 24 x ( 427 + 573 )
= 24 x 1000
= 24000
g ) 52 - 42 + 37 + 28 - 38 + 63
= ( 52 + 28 ) - ( 42 + 38 ) + ( 37 + 63 )
= 80 - 80 + 100
= 0 + 100
= 100
h ) 35 x 18 - 9 x 70 + 100
= 7 x 5 x 9 x 2 - 9 x 7 x 5 x 2 + 100
= 0 + 100
= 100
n ) 2008 x 867 + 2009 x 133
= 2008 x 867 + ( 2008 + 1 ) x 133
= 2008 x 867 + 2008 x 133 + 133
= 2008 x ( 867 + 133 ) + 133
= 2008 x 1000 + 133
= 2008000 + 133
= 2008133
i ) 326 x 78 + 327 x 22
= 326 x 78 + ( 326 + 1 ) x 22
= 326 x 78 + 326 x 22 + 22
= 326 x ( 78 + 22 ) + 22
= 326 x 100 + 22
= 32600 +22
= 32622
q ) ( 20 + 21 + 22 + 23 + 24 + 25 ) x ( 16 - 2 x 8 )
= ( 20 + 21 + 22 + 23 + 24 + 25 ) x ( 16 - 16)
= ( 20 + 21 + 22 + 23 + 24 + 25 ) x 0
= 0
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 25 + 69 + 75 + 11
= (25 + 75) + (69 + 11)
= 100 + 80
= 180
b) 64 x 867 + 36 x 867
= (64 + 36) x 867
= 100 x 867
= 86700
c) 25 x 989 x 4 + 25
= 25 x 4 x 989 + 25
= 100 x 989 + 25
= 98900 + 25
= 98925
![](https://rs.olm.vn/images/avt/0.png?1311)
1994 . 867 + 1995 . 133
=1994.867+ (1994+1).133
=1994.867+1994.133+1994
=1994.(867+133)+1994
=1994.1000+1994
=1994000+1994
=1995994
k mình nha!
![](https://rs.olm.vn/images/avt/0.png?1311)
2013 x 867 + 132 x 2013 + 2083
= 2013 x 867 + 132 x 867 + 2013 + 70
= 2013 x ( 867 + 132 + 1 ) + 70
= 2013 x 1000 + 70
= 2013070
2013 x 867 + 132 x 2013 + 2013 + 70
= 2013 ( 867 + 132 + 1 ) + 70
= 2013 x 1000 + 70
= 2013070
hok tốt
![](https://rs.olm.vn/images/avt/0.png?1311)
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
2008 x 867 + 2009 x 133
= 2008 x 867 + 2008 x 133 + 133
= 2008 x (867 + 133) + 133
= 2008 x 1000 + 133
= 2008133
64 x 867 + 867 x 36 - 30 x 867
= 867 (64 + 36 - 30)
= 867 * 70
= 60690
=867 x ( 64 + 36 - 30)
=867x 70
=60690