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14:(0,4+0,16:x)=7
=> (0,4+0,16:x)=14:7
=>(0,4+0,16:x)=2
=>0,16:x=2-0,4
=> 0,16:x =1,6
=>x= 0,16:1,6
=>x=0,1
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\(0,16\div x=2-0,4\)
\(\Leftrightarrow\frac{4}{25}\div x=2-\frac{2}{5}\)
\(\Leftrightarrow\frac{4}{25}\times\frac{1}{x}=\frac{10}{5}-\frac{2}{5}\)
\(\Leftrightarrow\frac{4}{25x}=\frac{8}{5}\)
\(\Leftrightarrow20=200x\)
\(\Leftrightarrow x=\frac{1}{10}\)
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a) \(1\frac{2}{7} = 1 + \frac{2}{7} = \frac{9}{2}\)
\(\begin{array}{l}x:1\frac{2}{7} = - 3,5\\x:\frac{9}{7} = - \frac{7}{2}\\x = - \frac{7}{2}.\frac{9}{7}\\x = - \frac{9}{2}\end{array}\)
b) \(0,4.x - \frac{1}{5}.x = \frac{3}{4}\)
\(\begin{array}{l}\frac{2}{5}.x - \frac{1}{5}.x = \frac{3}{4}\\\left( {\frac{2}{5} - \frac{1}{5}} \right).x = \frac{3}{4}\\\frac{1}{5}.x = \frac{3}{4}\\x = \frac{3}{4}:\frac{1}{5}\\x = \frac{3}{4}.5\\x = \frac{{15}}{4}\end{array}\)
14: ( 0,4+0,16 : x ) =7
0,4 + 0,16 : x = 14 : 7 = 2
0,16 : x = 2 - 0,4 = 1,6
x = 0,16 : 1,6 = 0,1
Vậy x = 0,1
14: ( 0,4+0,16 : x ) =7
=>\(0,4+0,16:x\)= 14:7
=>\(\left(0,4+0,16:x\right)=2\)
=>\(0,16:x=2-0,4\)
=>\(0,16:x=1,6\)
=> x=0,1