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\(x-1,5=60\%.x\)
\(\Rightarrow x-1,5=0,6.x\)
\(\Rightarrow x=0,6.x+1,5\)
\(\Rightarrow x-0,6.x=1,5\)
\(\Rightarrow\left(1-0,6\right).x=1,5\)
\(\Rightarrow0,4.x=1,5\)
\(\Rightarrow x=1,5:0,4\)
\(\Rightarrow x=3,75\)
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\(\text{2,43 . 4,54 + 2,16 . 4,54+ 4,59 . 5,46 }\)
\(=4,54.\left(2,43+2,16\right)+4,59.5,46\)
\(=\) \(4,54.\) \(4,59\) \(+4,59.5,46\)
\(=4,59.\left(4,54+5,46\right)\)
\(=4,59.10\)
\(=45,9\)
2,43 . 4,54 + 2,16 . 4,54 + 4,59 . 5,46
= 4,54 . (2,43 + 2,16) + 4,59 . 5,46
= 4,54 . 4,59 + 4,59 . 5,46
= 4,59 . (4,54 + 5,46)
= 4,59 . 10
= 45,9
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a: =-(234,905+36,058)
=-270,963
b: =-34,2*2,16=-73,872
d: =78,74:6,35=12,4
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tìm x , biết :
a . 1,5 . x + 2,5 = 1
\(1,5.x=-1,5\)
\(x=\dfrac{-1,5}{1,5}\)
\(x=-1\)
b . ( 0,5 . x - 1,3 ) : 0,5 = -1,7
\(0,5.x-1,3=-0,85\)
\(0,5x=-2,15\)
\(x=\dfrac{-2,15}{0,5}\)
\(x=-4,3\)
c . 1,75 .x - 1,5 . x = 0,84
\(x\left(1,75-1,5\right)=0,84\)
\(x.0,25=0,84\)
\(x=3,36\)
d . x + 75% . x + 125% = 1
\(x+\dfrac{75}{100}.x+\dfrac{125}{100}=1\)
\(x+\dfrac{3}{4}.x+\dfrac{5}{4}=1\)
\(x+\dfrac{3}{4}.x=-\dfrac{1}{4}\)
\(x.\left(1+\dfrac{3}{4}\right)=-\dfrac{1}{4}\)
\(x.1,75=-\dfrac{1}{4}\)
\(x=-\dfrac{1}{7}\)
e . x - 25% .x + 75% = 1
\(x-\dfrac{25}{100}.x+\dfrac{75}{100}=1\)
\(x-\dfrac{1}{4}.x+\dfrac{3}{4}=1\)
\(x-\dfrac{1}{4}.x=\dfrac{1}{4}\)
\(x.\left(1-\dfrac{1}{4}\right)=\dfrac{1}{4}\)
\(x.\dfrac{3}{4}=\dfrac{1}{4}\)
\(x=\dfrac{1}{3}\)
f . | x - 1,5 | = 2,37
TH1 : \(x-1,5=2,37\)
\(x=2,37+1,5\)
\(x=3,87\)
TH2 : \(x-1,5=-2,37\)
\(x=-2,37+1,5\)
\(x=-0,87\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,x+3,79=15,12\)\(\Rightarrow x=15,12-3,79\)\(\Rightarrow x=11,33\)
\(b,12,1-x=5,49\)\(\Rightarrow x=12,1-5,49\Rightarrow x=6,61\)
\(c,60,45:x=1,5\)\(\Rightarrow x=60,45:1,5\Rightarrow x=40,3\)
\(d,3,5.x-1,5.x=12,5\)
\(\Rightarrow x\left(3,5-1,5\right)=12,5\)
\(\Rightarrow x.2=12,25\Rightarrow x=12,25:2=6,125\)
\(d,12,5.x-2,5.x-50=2,5.10\)
\(\Rightarrow12,5.x-2,5.x-50=25\)
\(\Rightarrow x\left(12,5-2,5\right)=25+50\)
\(\Rightarrow x.10=75\)
\(\Rightarrow x=75:10=7,5\)
a) x=11,33 b) x=6,61 c)40,3
Mình chỉ biết làm tới đó thôi. xin lỗi nha
-1,5xx x=2,16
`=> x=2,16:(-1,5)`
`=> x=-1,44`
`-1,5 xx x = 2,16`
`=> x = 2,16 : (-1,5)`
`=> x= -1,44`