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a) 86 – 16 = 70
b) 23 x 2 – 1 = 23
c) 250 : 5 + 5 = 25
d) 40 + 80 : 4 = 30
e) 80 + 4 : 2 = 42
f) 70 + 30 : 2 = 50
g) 90 + 30 x 3 = 180
h) 70 + 30 : 2 = 85
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x + 70 = 70 + 30
x + 70 = 100
x = 100 - 70
x = 30
K mk nha
Mk k bạn 1 cái rùi đó
x + 70 = 70 + 30
x + 70 = 100
x = 100 - 70
x = 30
tk mk mk tk lại
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
x + 60 = 70 + 30
x + 60 = 130
x= 130 - 60
x = 70
K mk nha
x + 60 = 70 + 30
x + 60 = 100
x = 100 - 60
x = 40
tk mk mk tk lại
![](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)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 417 – (37 – 20) = 417 – 17
= 400
b) 826 – (70 + 30) = 826 – 100
= 726
c) 148 : (4 : 2) = 148 : 2
= 4
d) ( 30 + 20) x 5 = 50 x 5
= 250
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 90 – ( 30 – 20) = 90 – 10
= 80
90 – 30 – 20 = 60 - 20
= 40
b) 100 – (60 + 10) = 100 – 70
= 30
100 - 60 + 10 = 40 + 10
= 50
c) 135 – (30 + 5) = 135 – 35
= 100
135 – 30 – 5 = 105 – 5
= 100
d) 70 + (40 – 10) = 70 + 30
= 100
70 + 40 – 10 = 110 -10
= 100
x + 30 = 70 + 30
x + 30 = 100
x = 100 - 30
x = 70
Vậy x = 70
x + 30 = 70 + 30
x + 30 = 100
x = 100 - 30
x = 70