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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)
![](https://rs.olm.vn/images/avt/0.png?1311)
Tính nhanh:
1+2+3+4+5+6+7+8+9+10
=(1+9)+(2+8)+(3+7)+(4+6)+10+5
= 10 + 10 + 10 + 10 + 10+5
= 50 + 5
= 55
123*45+123*50+123*5
= 123*(45+50+5)
= 123 * 100
= 12300
K mk nha bn
![](https://rs.olm.vn/images/avt/0.png?1311)
![](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)
x - 123 = 123 + 123
x - 123 = 246
x = 246 + 123
x = 369
Vậy x = 369
\(x-123=123+123\)
\(x-123=246\)
\(x=246+123\)
\(x=389\) cho mình nha!
![](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 + 123 - 123 x 2
= 123 + 123 - 246
= 246 - 246
= 0
hi
123+123-123x 2
=246-123 x 2
=123 x 2
=246