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a) (12 + 8) x 4 = 20 x 4
= 80
12 + 8 x 4 = 12 + 32
= 44
b) 25 + 75 : 5 = 25 + 15
= 40
(25 + 75) : 5 = 100 : 5
= 20
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60\400 = 15\100 = 15%
60\500 = 12\100 = 12%
96\300 = 32\100 = 32%
\(\frac{60}{400}\)=\(\frac{15}{100}\) = 15 %
\(\frac{60}{500}\)=\(\frac{12}{100}\) = 12 %
\(\frac{96}{300}\)=\(\frac{32}{100}\) = 32 %
![](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)
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x : 75 : x + 25 : x = 10
x : (75 + 25) = 10
x : 100 = 10
x = 10 x 100
x = 1000
`75 xx 1/x + 25 xx 1/x = 10`
`1/x xx (75+25) = 10`
`=> 1/x xx 100 = 10`
`=> 1/x = 10/100`
`=> 1/x = 1/10`
`=> x = 10`.
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
75 - { x + 8 } = 60
{ x + 8 } = 75 - 60
{ x + 8 } = 15
x = 15 - 8
=> x = 7
75 + x = 25 + 60
75 + x = 85
x = 85 - 75
x = 10
tk cho mk với nha bn
ma kết là tôi
75+x=25+60
75+x=85
x=87-75
x=10