123+ 45 +56=
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![](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)
123×45+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 #
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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)
x + 123 - 45 = 678
x= 678 + 45 - 123
x = 600
78 - 56 + x = 234
22 + x = 234
x = 234 - 22
x = 212
Linh Nguyễn sai rồi
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 3.(37 - \(x\)) - 56 = 1
3.(37 - \(x\)) = 1 + 56
3.(37 - \(x\)) = 57
37 - \(x\) = 57 : 3
37 - \(x\) = 19
\(x\) = 37 - 19
\(x\) = 18
b, 95 - (2\(x\) - 1).4 = 14
(2\(x\) - 1).4 = 95 - 14
(2\(x\) - 1).4 = 81
2\(x\) - 1 = 81 : 4
2\(x\) = \(\dfrac{81}{4}\) - 1
2\(x\) = \(\dfrac{85}{4}\)
\(x\) = \(\dfrac{85}{4}\) : 2
\(x\) = \(\dfrac{85}{8}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) = (-357) - 156 + 357 + 56
= (-357 + 357) + (-156 +56)
= 0 + (-100)
= -100
b) = (-4) .(-25) .123
= 100 .123
= 12300
c) = -144 - 18 + 45
= -162 + 45
= -117
Chúc bạn học tốt !
![](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)
123+ 45 +56=224
Trả lời:
= 224