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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) \(x-20\%\times x=216\)
\(x\times\left(1-20\%\right)=216\)
\(x\times80\%=216\)
\(x\times0,8=216\)
\(x=216:0,8\)
\(x=270\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(X\times20o/o+X=7,2\)
\(\Leftrightarrow\)2x+0,2=7,2
\(\Leftrightarrow\)2x =7,2-0,2
\(\Leftrightarrow\)2x = 7
\(\Rightarrow\) x =7:2
\(\Rightarrow\)x =3,5
\(40o/o\times X+X\times20o/o=72\)
\(\Leftrightarrow0,4\times X+X\times0,2=72\)
\(\Leftrightarrow X\times\left(0,4+0,2\right)=72\)
\(\Leftrightarrow X\times0,6=72\)
\(\Rightarrow X=72:0,6\)
\(\Rightarrow X=120\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
x + 20% * x = 7.2
x +1/5 * x = 7.2
x * ( 1 + 1/5 ) = 7.2
x * 1.2 = 7.2
x = 7.2 : 1.2
x = 6
40% * x + x * 20% = 72
2/5 * x + x * 1/5 = 72
( 2/5 + 1/5 ) * x = 72
0.6 * x = 72
x = 72 : 0.6
x = 120
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![](https://rs.olm.vn/images/avt/0.png?1311)
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40/100 x X + X x 20/100 = 72
2/5 x X + X x 1/5 = 72
X x ( 2/5 + 1/5 ) = 72
X x 3/5 = 72
X = 72 : 3/5
X = 120
Trả lời :
40%*X+X*20%=72
\(40\%\) \(.\)\(x\) \(+\) \(x\) \(.\) \(\frac{20}{100}\)\(=\)\(72\)
\(\frac{40}{100}\)\(.\)\(x\)\(+\)\(x\)\(\frac{1}{5}\)\(=\)\(72\)
\(x\)\(.\)\(\left(\frac{2}{5}+\frac{1}{5}\right)\)\(=\)\(72\)
\(x\)\(.\)\(\frac{3}{5}\)\(=\) \(72\)
\(x\)\(=\) \(72\)\(:\)\(\frac{3}{5}\)
\(x\)\(=\) \(120\)