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a; 100% : \(x\) - 50% : \(x\) + 40% : \(x\) = 18 + 30% : \(x\)
(100% - 50% + 40%): \(x\) = 18 + 30% : \(x\)
90% : \(x\) = 18 + 30% : \(x\)
90%: \(x\) - 30%: \(x\) = 18
60% : \(x\) = 18
\(x\) = 60% : 18
\(x\) = \(\dfrac{1}{30}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
100%x-50%:x+40%:x=18+30%:x
<=>x-x/2+2/5x=18+3/10x
<=>10x2-5x2+4=180x+3
<=>10x2-5x2+4-180x-3
<=>5x2-180x+1=0
Denta=(-180)2-4.5.1=32380
Phương trình có 2 nghiệm phân biệt :
x1=180+căn32380/10;x2=180-căn32380/10
![](https://rs.olm.vn/images/avt/0.png?1311)
100%:x-50%:x+40%:x=18+30%:x
<=> (100% - 50% + 40%) : x = 18 + 30% : x
<=> 90% : x = 18 + 30% : x
=> 90% : x - 30% : x = 18
=> (90% - 30%) : x = 18
<=> x = 60% : 18
=> x = 1/30
![](https://rs.olm.vn/images/avt/0.png?1311)
=1x0.5:X+0.4:X = 18+0.3:X
=0.5:X+0.4:X = 18+0.3:X
=(0.5+0.4):X = 18+0.3:X
=0.9:X = 18+0.3:X
18=(0.9-0.3):X
18=0.6:X
X=18:0.6
X=30
![](https://rs.olm.vn/images/avt/0.png?1311)
100% : x - 50% : x + 40% : x = 18 + 30% : x
100% : x - 50% : x + 40% : x - 30% : x = 18
( 100% - 50% + 40% - 30% ) : x = 18
60% : x = 18
x = 60% : 18
x = 3/5 . 1/18
x = 1/30
Vậy x = 1/30
![](https://rs.olm.vn/images/avt/0.png?1311)
tìm x biết
100% : x - 50% : x + 40 % : x = 18 + 30%
1 : x - 0.5 + 0.4 : x = 18 + 0.3
( 1 - 0.5 + 0.4 ) : x = 17.7
0.9 : x = 17.7
x = 0.9 : 17.7
x = \(\frac{3}{59}\)