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![](https://rs.olm.vn/images/avt/0.png?1311)
123 x 45 + 231 x 89 + 56
= 5535 + 20559 + 56
= 26094 + 6
= 26100
![](https://rs.olm.vn/images/avt/0.png?1311)
123 x 56 + 123 x 45 - 123
= 123 x (56 + 45 - 1)
= 123 x 100
= 12300
123x56+123x45-123
123x56+123x45-123x1
123x(56+45-1)
123x(101-1)
123x100
12300
![](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)
12 + 34 + 56 + 78 + 123 + 99 + 322 + 199 = 1223
12 x 45 x 67 x 89 x 0 = 0
12 : 4 : 3 x 9 : 3 x 1259 = 3777
Tk nha
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 98 + 3 + 97 +2
= (98 +2) + ( 97 + 3)
= 100 + 100 = 200
56 + 399 + 1 + 4
= (56 + 4) +( 399 + 1)
= 60 + 400 = 460
b) 364 + 136 + 219 + 181
= (364 + 136) + (219 + 181
= 500 + 400 = 900
178 277 + 123 + 422
= (178 + 422) + (277 + 123)
= 600 + 400 = 1000
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 #