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\(x\) \(\times\) \(\dfrac{4}{5}\) = 15
\(x\) = 15 : \(\dfrac{4}{5}\)
\(x\) = \(\dfrac{75}{4}\)
\(\dfrac{12}{25}\) \(\times\) \(x\) = \(\dfrac{4}{10}\)
\(x\) = \(\dfrac{4}{10}\) : \(\dfrac{12}{25}\)
\(x\) = \(\dfrac{5}{6}\)
\(\dfrac{4}{3}\times\dfrac{7}{5}\times2:\dfrac{34}{9}\times\dfrac{15}{4}\)
\(=\left(\dfrac{4}{3}\times\dfrac{15}{4}\right)\times\left(\dfrac{14}{5}\times\dfrac{9}{34}\right)\)
\(=5\times\dfrac{63}{85}\)
\(=\dfrac{63}{17}\)
bài2 \(x\times\dfrac{15}{16}-x\times\dfrac{4}{16}=2\)
\(x\times\dfrac{11}{16}=2\)
\(x=2:\dfrac{11}{16}\)
\(x=\dfrac{32}{11}\)
Bài 1 :
\(\dfrac{x}{16}\times\left(2017-1\right)=2\)
\(\dfrac{x}{16}\times2016=2\)
\(\dfrac{x}{16}=\dfrac{2}{2016}\)
\(x=\dfrac{2}{2016}\times16\)
\(x=\dfrac{1}{63}\)
a: =>7/9:x=1/18-2/9=1/18-4/18=-3/18=-1/6
=>x=-7/9:1/6=-7/9*6=-42/9=-14/3
b: =>x*7/5=2/15+2/5=8/15
=>x=8/15:7/5=8/21
c: =>x-1/2=3/14:4/7=3/8
=>x=3/8+4/8=7/8
d: =>0,4x+0,3x-0,2x=0,7
=>0,5x=0,7
=>x=1,4
1.
7/15:(1/2-9/10xX)-1/6=13/6
=>7/15:(1/2-9/10xX)=13/6+1/6
=>7/16:(1/2-9/10xX)=7/3
=>1/2-9/10xX=7/16:7/3
=>1/2-9/10xX=3/16
=>9/10xX=1/2-3/16
=>9/10xX=5/16
=>X=5/16:9/10
=>X=25/72
a)2012(x-9)=1-1
2012(x-9)=0
x-9=0:2012
x-9=0
x=0+9
x=9
b)15(3x+5)=165-45
15(3x+5)=120
3x+5=120:15
3x+5=8
3x=8-5
3x=3
x=3:3
x=1
1) 2012.[ x - 9 ] + 1 = 1
<=> 2012.[ x - 9 ] = <=> x - 9 = 0 : 2012 <=> x - 9 = 0 => x = 9
2) 165 - 15[ 3x + 5 ] = 5.9
<=>165 - 15[ 3x + 5 ] = 45 <=> 15[ 3x + 5 ] = 120 <=> 3x + 5 = 8 <=> 3x = 3 => x = 1