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a, X + 20% x X = 7,2
X + 1/5 x X = 7,2
X + 1/5 x X + 1 = 7,2
X . ( 1/5 + 1 ) = 7,2
X . 1,2 = 7,2
X = 7,2 : 1,2
X = 6
Vậy X =6
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) \(x-20\%\times x=216\)
\(x\times\left(1-20\%\right)=216\)
\(x\times80\%=216\)
\(x\times0,8=216\)
\(x=216:0,8\)
\(x=270\)
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
\(X\times20o/o+X=7,2\)
\(\Leftrightarrow\)2x+0,2=7,2
\(\Leftrightarrow\)2x =7,2-0,2
\(\Leftrightarrow\)2x = 7
\(\Rightarrow\) x =7:2
\(\Rightarrow\)x =3,5
\(40o/o\times X+X\times20o/o=72\)
\(\Leftrightarrow0,4\times X+X\times0,2=72\)
\(\Leftrightarrow X\times\left(0,4+0,2\right)=72\)
\(\Leftrightarrow X\times0,6=72\)
\(\Rightarrow X=72:0,6\)
\(\Rightarrow X=120\)
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
a) X + 20% x X = 7,2
<=> X x ( 1+ 20%) = 7,2
<=> X x 6/5 = 7,2
<=> X = 6
b) X x 4 + 1/2 x X = 55,35
<=> X x ( 4+ 1/2) = 55,35
<=> X x 4,5 = 55,35
<=> X = 12,3
c) 40% x X + X x 20% = 72
<=> X x ( 40% + 20%) = 72
<=> X x 60% = 72
<=> X x 3/5 = 72
<=> X = 120
d) X - 20% x X = 216
<=> X x ( 1 - 20%) = 216
<=> X x 4/5 = 216
<=> X = 270