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![](https://rs.olm.vn/images/avt/0.png?1311)
Hướng dẫn giải:
a) 71 x 5 x 4 = 71 x (5 x 4) = 71 x 20 = 1420
b) 123 x 50 x 2 = 123 x (50 x 2) = 123 x 100 = 12300
c) 4 x 138 x 25 = (4 x 25) x 138 = 100 x 138 = 13800
d) 25 x 96 x 4 = (25 x 4) x 96 = 100 x 96 = 9600
e) 5 x 81 x 2 = (5 x 2) x 81 = 10 x 81 = 810
g) 50 x 104 x 2 = (50 x 2) x 104 = 100 x 104 = 10400
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,123\times54+27\times123-12\times123+123\times31\)
\(=123\times\left(54+27-12+31\right)\)
\(=123\times100\)
\(=12300\)
\(b,\dfrac{121}{27}\times\dfrac{54}{11}< n< \dfrac{100}{21}:\dfrac{25}{126}\)
\(22< n< \dfrac{100}{21}\times\dfrac{126}{25}\)
\(22< n< 24\)
Vì \(23>22\) và \(23< 24\) nên \(n=23\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a123x54+27x123-12x123+123x31
=123:54+27:123-12:123+123:31
=6642+27:123-12:123+123:31
=6642+3321-12:123+123:31
=6642+3321-1476+123:31
=6642+3321-1476+3813
=12300
b,121/27x54/11<n>100/21:25/126
=22<n>24
n=23
![](https://rs.olm.vn/images/avt/0.png?1311)
\(=123\times\left(6+3+1\right)\)
\(=123\times10\)
\(=1230\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(123\times137-123\times36-123=123\times\left(137-36-1\right)=123\times100=12300\)
![](https://rs.olm.vn/images/avt/0.png?1311)
123×45+123×55
=123×(45+55)
=123×100
=12300
56×4+56×3+56×2+56
=56×4+56×3+56×2+56×1
=56×(4+3+2+1)
=56×10
=560
[ 123×154-65×123]:89
=[123×(154-65)]:89
= 123×89:89
=123×(89:89)
=123×1
=123
123 x 45 + 123 x 55
= 123 x ( 45 + 55 )
= 123 x 100
= 12300
56 x 4 + 56 x 3 + 56 x 2 + 56
= 56 x ( 4 + 3 + 2 + 1 )
= 56 x 10
= 560
[ 123 x 154 - 65 x 123 ] : 89
= [ 123 x ( 154 - 65 ) ] : 89
= [ 123 x 89 ] : 89
= 123
Học tốt #
![](https://rs.olm.vn/images/avt/0.png?1311)
123+45x123+54x123
= 123x(1+45+54)
= 123x100
= 12300
144x25x36
= 3600x36
= 129600
a.= 123 x ( 45 + 43 + 12 )
= 123 x 100
= 12 300
b. =( 2 x 5 ) x ( 4 x 25 ) x ( 8 x 12 )
= 10 x 100 x 96
= 1000 x 96
= 96 000
a.123 x (45+43+12)
=123 x 100
=12300