X + 20 = 50
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
20 + 20 + 20 + 20 + 20 + 50 + 50 + 50 + 50
= 20 x 5 + 50 x 4
= 100 + 50 x 4
= 100 + 200
= 300
x + 50 - 20 = 50 + 20
x + 50 - 20 = 70
x + 50 = 70 + 20
x + 50 = 90
x = 90 - 50
x = 40
Ủng hộ tíck mik nha !!!
![](https://rs.olm.vn/images/avt/0.png?1311)
x+20=20+50+50
x+20=120
x=120-20
x=100
k nhé trang rùi mình k lại
x + 20 = 20 + 50 + 50
x + 20 = 70 + 50
x + 20 = 120
x = 120 - 20
x = 100
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
x + 20 = 50 + 50 + 50
x + 20 = 50 x 3
x + 20 = 150
=> x = 130.
x+20=3x50=150
x=150-20=130
x=130
thu lai 130+20 = 50+50+50=150
![](https://rs.olm.vn/images/avt/0.png?1311)
50 + 50 + 50 x 100 - 20 = 50 x 100 + 50 + 50 - 20 = 5000 + 50 + 50 - 20 =5100 - 20 = 5080
![](https://rs.olm.vn/images/avt/0.png?1311)
a) Ta có B (12) = {0;12;24;36;48;60;72,..}. Mà 20 ≤ x ≤ 50 ;
=> xϵ {24;36;48}.
b) x ϵ {10;20}.
c) x ϵ {0;7;14;21;28;35;42;49}.
d) x ϵ {1;2;3;4;6;12
![](https://rs.olm.vn/images/avt/0.png?1311)
= ( 60 + 50+40+30+20+10 ) x 2000 + 1500
= 210 x 2000 + 1500
= 420000 + 1500
= 421500
![](https://rs.olm.vn/images/avt/0.png?1311)
x + 50 = 50 + 20
x + 50 = 70
x = 70 - 50
x = 20
ai k mk mk k lại ^_^
trao đổi k nhìu càng tốt ^_^
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
x - 20 = 50 + 50
x - 20 = 100
x = 100 + 20
x = 120
tk nha
`x+20=50`
`x=50-20`
`x=30`
Vậy `x=30`
x+20=50
x=50-20
x=30