x-123=12
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
12 x X = 123 x 123 + 409
12 x X = 15129 + 409
12 x X = 15538
X = 15538 : 12
X = \(\dfrac{7769}{6}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
123 + 123 + 23 +12 = 281
12 x 4 =48
ai qua nhớ cho mk nha ^_-,cảm ơn cac bn nhìu
![](https://rs.olm.vn/images/avt/0.png?1311)
12 : 3 = 4 x 4 = 16
20 x 3 = 60
90 : 1 = 90
123 - 123 = 0
10 x 9 = 90 : 9 = 10
12 - 9 = 3 x 9 = 27
23 - 5 = 18
123 + 12 = 135
1000 - 200 = 800
333 - 111 = 222
\(20.3=60\)
\(90.1=90\)
\(123-123=0\)
\(10.9=\frac{810}{9}=90\)
\(23-5=15\)
\(123+12=135\)
\(1000-200=800\)
\(333-111=222\)
![](https://rs.olm.vn/images/avt/0.png?1311)
123-x=123.(12-1)
123-x=123.11
123-x=1353
x=1353:123
x=11
vậy x=11
Bài làm
123 - x = 123 . ( 12 - 1 )
123 - x = 123 . 11
123 - x = 1353
x = 123 - 1353
x = -1230
Vậy x = -1230
# Học tốt #
![](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)
![](https://rs.olm.vn/images/avt/0.png?1311)
X-123=12
X =12+123
X =135
x - 123 = 12
x = 12 + 123
x = 245