2,8:(1/5-3x)=7/5
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\(2,8:\left(\frac{1}{5}-3x\right)=1\frac{2}{5}\)
\(\frac{14}{5}:\left(\frac{1}{5}-3x\right)=\frac{7}{5}\)
\(\frac{1}{5}-3x=2\)
\(3x=\frac{-9}{10}\)
\(x=\frac{-3}{10}\)
Vậy \(x=\frac{-3}{10}\)
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\(2.8:\left(\frac{1}{5}-3x\right)=1\frac{2}{5}\)
\(\frac{14}{5}:\left(\frac{1}{5}-3x\right)=\frac{7}{5}\)
\(\frac{1}{5}-3x=\frac{14}{5}:\frac{7}{5}\)
\(\frac{1}{5}-3x=2\)
\(3x=\frac{1}{5}-2\)
\(3x=-\frac{9}{5}\)
\(x=-\frac{3}{5}\)
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Đề bạn tự ghi lại nha, mình chỉ ghi cách trình bày thôi
-6/10*x-7/3=27/5
-6/10*x =27/5+7/3
-6/10*x =116/15
x =116/15:-6/10
x =116/15*10/-6
x =-116/9
đề bạn tự ghi lun nha
14/5:(3-3x)=7/5
3-3x =14/5:7/5=14/5*5/7=2/1*1/1
3-3x =2
3x =3-2
3x =1
x =1:3
vậy x =1/3
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\(\Rightarrow\) 1/5-3x = 2/8 : 7/5 = 5/28
\(\Rightarrow\) 3x = 1/5 - 5/28 = 3/140
\(\Rightarrow\) x = 3/140 : 3 = 1/140
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2: \(=\dfrac{203}{60}\cdot\dfrac{81}{1225}=\dfrac{783}{3500}\)
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a) \(-0,6x-\dfrac{7}{3}=5,4\Leftrightarrow-\dfrac{3}{5}x=5,4+\dfrac{7}{3}\Leftrightarrow x=\dfrac{116}{15}.\left(-\dfrac{5}{3}\right)=-\dfrac{116}{9}\).
b) \(2,8:\left(\dfrac{1}{5}-3x\right)=1\dfrac{2}{5}\Leftrightarrow\dfrac{1}{5}-3x=2,8:\dfrac{7}{5}\Leftrightarrow-3x=2-\dfrac{1}{5}\Leftrightarrow x=\dfrac{9}{5}:\left(-3\right)=-\dfrac{3}{5}\).
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\(2,8:\left(3.x-\frac{5}{8}\right)=2\frac{2}{5}\)
=>\(\frac{14}{5}:\left(3.x-\frac{5}{8}\right)=\frac{12}{5}\)
=>\(\frac{14}{5}:\frac{13}{5}=3.x-\frac{5}{8}\)
=>\(3.x-\frac{5}{8}=\frac{14}{13}\)
=>\(3.x=\frac{14}{13}+\frac{5}{8}\)
=>\(3.x=\frac{177}{104}\)
=>\(x=\frac{59}{104}\)
2,8 :( 3x -5/8)= 2/2/5
2,8:( 3x- 5,8)= 12/5
3x-5/8 = 2,8:12/5
3x -5/8 = 7/6
3x= 7/6 +5/8
3x= 43/ 24
x= 43/24 :3
x= 43/72
nha bn, mknghix vậy
Ta có: \(2,8:\left(\frac{1}{5}-3x\right)=\frac{7}{5}\)
\(\Leftrightarrow\frac{14}{5}:\left(\frac{1}{5}-3x\right)=\frac{7}{5}\)
\(\Leftrightarrow\frac{1}{5}-3x=2\)
\(\Leftrightarrow3x=\frac{1}{5}-2=\frac{9}{5}\)
hay \(x=\frac{3}{5}\)
Vậy: \(x=\frac{3}{5}\)