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23x+14y-8x+y
=(23x-8x)+(14y+y)
=15x+15y
=15(x+y)
\(=15\cdot100=1500\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,100.123-123.100\)
\(=100.\left(123-123\right)\)
\(=100.0\)
\(=0\)
\(b,10.30+70.10\)
\(=10.\left(30+70\right)\)
\(=10.100\)
\(=1000\)
a) 100 x 123 - 123 x 100
= 100 x ( 123 - 123 )
= 100 x 0
=100
b) 10 x 30 + 70 x 10
= 10 x ( 30 + 70)
= 10 x 10
= 100
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) -100 - 12
= -100 + (-12)
= -112
b) 143 - (-123)
= 143 + 123
= 266
c) -116 - (-16)
= -116 + 16
= -100
d) -123 - 20
= -123 + (-20)
= -143
a)(-100)-12
=-112
b)143-(-123)
=143+123
=266
c)(-116)-(-16)
=(-116)+16
=-100
d)(-123)-20
=-143
![](https://rs.olm.vn/images/avt/0.png?1311)
123.x+100=369
=>123.x=369-100
=>123.x=269
=>x=269:123
=>x=269/123
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) (–38) + 28 = –(38 – 28) = –10.
b) 273 + (–123) = 273 – 123 = 150.
c) 99 + (–100) + 101 = (99 + 101) + (–100) = 200 + (–100) = 100.
123 - 100 = 23x
=> 23 = 23 × x
=> 23 × x = 23
=> x = 1
Trả lời :
123 - 100 = 23x
=> 23x = 123 - 100
23x = 23
=> x = 23 : 23
x = 1
Vậy x = 1