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=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
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a) 10*(x-1)=15-5
10*(x-1)=10
(x-1)=10:10
(x-1)=1
x=1+1
x=2
b) x+1+x+2+x+3=18
3x+6=18
3x=18-6
3x=12
x=12:3
x=4
c) 17+2*(x+2)=25
2*(x+2)=25-17
2*(x+2)=8
x+2=8:2
x+2=4
x=4-2
x=2
d) x:17=82-17+26
x:17=91
x=91*17
x=1547
e) 147*x=441
x=441:147
x=3
g)(x:81)=330:10:11
(x:81)=3
x=3*81
x=243
i)x+1+x+2+x+3+x+4+x+5=40
5x+15=40
5x=40-15
5x=25
x=5
Ủng hộ nha
bạn làm sao ấy đề mink viet khac ma ban vite mot neo
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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
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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
\(x\) = \(\dfrac{1}{30}\)
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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