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120 : 30 x 100 + 1000 - 100 =?
= 4 x 100 + 1000 - 100
= 400 + 1000 - 100
= 1400 - 100
= 1300
120 : 30 x 100 + 1000 - 100
= 4 x 100 + 1000 - 100
= 400 + 1000 - 100
= 1400 - 100
= 1300
![](https://rs.olm.vn/images/avt/0.png?1311)
a) x : 4 = 8
x = 8 × 4
x = 32
b) 4 × x = 12 + 8
4 × x = 20
x = 20 : 4
x = 5
c) 30 : x = 14 + 16
30 : x = 30
x = 30 : 30
x = 1
![](https://rs.olm.vn/images/avt/0.png?1311)
y x 2 + y x 4 + y x 2 = 120
y x ( 2 + 4 + 2 ) = 120
y x 10 = 120
y = 120 : 10
y = 12
![](https://rs.olm.vn/images/avt/0.png?1311)
y x 2 + y x 4 + y x 2 = 120
y x ( 2 + 4 + 2 ) = 120
y x 10 = 120
y = 120 : 10
y = 12
cong chua nu cuoi
y x 2 + y x 4 + y x 2 = 120
y x ( 2 + 4 + 2 ) = 120
y x 8 = 120
y = 120 : 8
y = 15
![](https://rs.olm.vn/images/avt/0.png?1311)
y x 2 + y x 4 + y x 6 = 120
y x ( 2+ 4 + 6 ) = 120
y x 8 = 120
y = 120 : 8
y = 15
y x 2 + y x 4 + y x 6 = 120
y x ( 2 + 4 + 6 ) = 120
y x 12 = 120
y = 120 / 12
y = 10
![](https://rs.olm.vn/images/avt/0.png?1311)
y x 2 + y x 4 + y x 2 = 120
y x ( 2 + 4 + 2 ) = 120
y x 8 = 120
y = 120 : 8
y = 15
y x 2 + y x 4 + y x 2 = 120
y x ( 2 + 4 + 2 ) = 120
y x 10 = 120
y = 120 : 10
y = 12
Le anh tu
![](https://rs.olm.vn/images/avt/0.png?1311)
a x 2 + a + a x 4 = 30
=> a x 2 + a x 1 + a x 4 = 30
=> a x (2 + 1 + 4) = 30
=> a x 7 = 30
=> a = 30 : 7
=> a = 30/7
Đáp án là C.120
\(4x30=120\)
Đáp án : C