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x(100%+20%)=7.2
x120%=720%
x=720%:120%
x=6
vậy////////
(40%+100%)x+20%=720%
140%x=720%-20%
140%x=700%
x=720%:140%
x=36/7
vậy x=/////////////
![](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)
a) X + 20% x X = 7,2
100% X + 20% x X = 7,2
( 100% + 20% ) x X = 7,2
120% x X = 7,2
X = 7,2 : 120%
X = 6
b) X - 20% x X = 216
100% X - 20% x X = 216
( 100% - 20% ) x X = 216
80% x X = 216
X = 216 : 80%
X = 270
![](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
![](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)
x + 20 % *x = 7,2
x + 0,2 + 1 = 7,2
x = 7,2 -1 - 0,2
x = 6
x+20%*x = 7,2 = 120% của x là 7,2
x là : 7,2:120%
x = 6
![](https://rs.olm.vn/images/avt/0.png?1311)
X +\(\frac{1}{5}\)+ X= 7,2
X + X +\(\frac{1}{5}\) =7,2 ( phép cộng có tính chất giao hoán)
X x2 +\(\frac{1}{5}\) =7,2
X x2 =7,2 - \(\frac{1}{5}\)
X x2 =7
X = 7:2
X =3,5
\(x+20\%+x=7,2\)
\(\left(x+x\right)+0,2=7,2\)
\(2x=7,2-0,2\)
\(2x=7\)
\(x=7:2\)
\(x=3,5\)
![](https://rs.olm.vn/images/avt/0.png?1311)
x+20%+x=7,2
=> x+x+20%=7,2
=> 2x+0,2 =7,2
=> 2x =7,2-0,2
=> 2x =7
=> x =7:2
=> x =3,5
Vậy x=3,5
x+20%+x=7,2
=> x+x+20%=7,2
=> 2x+0,2 =7,2
=> 2x =7,2-0,2
=> 2x =7
=> x =7:2
=> x =3,5
Vậy x=3,5
**** nha các bạn !!!
![](https://rs.olm.vn/images/avt/0.png?1311)
X + 20% x X = 7,2
X x 1 + X x 1/5 = 7,2
X x (1 + 1/5) = 7,2
X x 6/5 = 7,2
X = 7,2 : 6/5
X = 7,2 x 5 / 6
X = 6
X + 20%x X=7,2
=> X+ \(\frac{1}{5}\)x X=7,2
=> X x( 1+\(\frac{1}{5}\))=7,2
=> X x \(\frac{6}{5}\)=7,2
=> X=6