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2 tháng 4 2016

a. x:(1/2+2/3)=6/5

=>x:7/6=6/5

=>x=6/5*7/6=>x=7/5

b.(x-1/2)-5(x-2/3)=3/2x

=>x-1/2-5x+10/3=3/2x

=>-4x+17/6=3/2x

=>17/6x=3/2x--4x

=>17/6=x(3/2+4)=>17/6=11/2x=>x=17/33

c.-5(x+1/5)-1/2(x-2/3)=x

=>-5x-1-1/2x+1/3=x=>-11/2x-2/3=x

=>-2/3=x+11/2x=>-2/3=x(1+11/2)=>-2/3=13/2x

=>x=-4/39

a) x : (1/2 + 2/3) = 6/5

=> x : 7/6 = 6/5

=> x = 6/5 x 7/6

      x = 7/5

b) , c) ko bít hihi

26 tháng 7 2020

\(\left(x-2\right):2.3=6\)

\(\Leftrightarrow\left(x-2\right):2=2\)

\(\Leftrightarrow\left(x-2\right)=4\)

\(\Leftrightarrow x=4+2=6\)

c) ta có

\(\left[\left(2x+1\right)+1\right]m:2=625\)

\(\Leftrightarrow\left[\left(2x+1\right)+1\right]\left\{\left[\left(2x+1\right)-1\right]:2+1\right\}=1250\)

\(\Leftrightarrow\left(2x+1\right)^2+1-1:2+1=1250\)

\(\Leftrightarrow\left(2x+1\right)^2+1-2+1=1250\)

\(\Leftrightarrow\left(2x+1\right)^2+1-2=1249\)

\(\Leftrightarrow\left(2x+1\right)^2+1=1251\)

\(\Leftrightarrow\left(2x+1\right)^2=1250\)

...

2

\(\left(x-\frac{1}{2}\right).\frac{5}{3}=\frac{7}{4}-\frac{1}{2}\)

\(\Leftrightarrow\left(x-\frac{1}{2}\right).\frac{5}{3}=\frac{5}{4}\)

\(\Leftrightarrow\left(x-\frac{1}{2}\right)=\frac{5}{4}:\frac{5}{3}\)

\(\Leftrightarrow\left(x-\frac{1}{2}\right)=\frac{5}{4}.\frac{3}{5}\)

\(\Leftrightarrow x-\frac{1}{2}=\frac{3}{4}\)

\(\Leftrightarrow x=\frac{3}{4}+\frac{1}{2}=\frac{5}{4}\)

20 tháng 7 2017

-5(x+1/5)-1/2(x-2/3)=3/2x-5/6

-5x-5.1/5-1/2x+1/2.2/3=3/2x-5/6

-5x-1-1/2x+1/3=3/2x-5/6

(-5x-1/2x)-(1-1/3)=3/2x-5/6

-11/2x-2/3=3/2x-5/6

-11/2x-3/2x=2/3-5/6

-7x=-1/6

x=-1/6:(-7)

x=1/42

10 tháng 3 2017

<=> -5x - 1 - 1/2x + 1/3 = 3/2x - 5/6

<=> -5x - 1/2x - 3/2x     = -5/6 + 1 - 1/3

<=> -7x                        = -1/6

<=>  x                          = -1/6 : (-7)

<=> x                           = 1/42

\(1,-\frac{1}{5}x-\frac{2}{3}=\frac{1}{10}x+\frac{5}{6}\)

\(-\frac{1}{5}x-\frac{2}{3}-\frac{1}{10}x-\frac{5}{6}=0\)

\(-\frac{3}{10}x-\frac{3}{2}=0\)

\(-\frac{3}{10}x=\frac{3}{2}\)

\(x=-5\)

\(2,2\left(x-\frac{1}{3}\right)-3\left(x-\frac{1}{2}\right)=\frac{1}{2}x\)

\(x-\frac{2}{3}-3x+\frac{3}{2}=\frac{1}{2}x\)

\(-2x+\frac{5}{6}=\frac{1}{2}x\)

\(-2x-\frac{1}{2}x+\frac{5}{6}=0\)

\(-\frac{5}{2}x=-\frac{5}{6}\)

\(x=\frac{1}{3}\)