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x + 100 = 200 - 300
x + 100 = - 100
x = 100 - 100
x = 0
x - 300 = 400 - 500
x - 300 = -100
x = -100 + 300
x = 200
k mik mik k lại
x + 100 = 200 - 300
x + 100 = -100
x = -100 - 100
x = -200
x - 300 = 400 - 500
x - 300 = -100
x = -100 + 300
x = 200
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
400 + 300 = 100 + 500 + x
700 = 600 + x
x = 700 - 600
x = 100
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 200 + 300 x 2 - 100 + ( -100)
= 200 + 600 - 100 + ( -100 )
= 800 - 100 + ( -100 )
= 700 + ( -100 )
= 600
b) 500 - 100 x 3 + ( -13 )
= 500 - 300 + ( -13 )
= 200 + ( -13 )
= 187
a ) 200 + 300 x 2 - 100 + ( - 100 )
= 200 + 600 - 100 + ( - 100 )
= 800 - 100 + ( - 100 )
= 700 + ( - 100 )
= 600
b ) 500 - 100 x 3 + ( - 13 )
= 500 - 300 + ( - 13 )
= 200 + ( - 13 )
= 187
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
100+200+300+400+500+500
=300+300+400+500+500
=300X2+400+500X2
=600+400+1000
=1000+1000
=2000
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
x+100=300-500
x+100=-200
x=-200-100
x=-300
x + 100 = 300 - 500
x + 100 = - 200
x = - 200 - 100
x = - 300