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a) \(40\%\times x+x\times20\%=72\)
\(\left(40\%+20\%\right)\times x=72\)
\(60\%\times x=72\)
\(0,6\times x=72\)
\(x=72:0,6\)
\(x=120\)
b) \(x-20\%\times x=216\)
\(x\times\left(1-20\%\right)=216\)
\(x\times80\%=216\)
\(x\times0,8=216\)
\(x=216:0,8\)
\(x=270\)
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![](https://rs.olm.vn/images/avt/0.png?1311)
\(72:x=20\)
\(x=72:20\)
\(x=3,6\)
\(57:x=3,8\)
\(x=57:3,8\)
\(x=15\)
\(24:x=4,8\)
\(x=24:4,8\)
\(x=5\)
\(x\times10=8,5\)
\(x=8,5:10\)
\(x=0,85\)
72 : \(\chi\) = 20
\(\chi\) = 72 : 20
\(\chi\) = 3,6
57 :\(\chi\) = 3,8
\(\chi\) = 57 : 3,8
\(\chi\) = 15
24 :\(\chi\) = 4,8
\(\chi\) = 24 : 4,8
\(\chi\) = 5
\(\chi\)x 10 = 8,5
\(\chi\) = 8,5 : 10
\(\chi\) = 0,85
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
72:x=20
x=72:20
x=3,6
tick nha
72/x=20
x=72/20
x=3,6