có phải là army ko

\(\frac{-15}{12}x+\frac{3}{2}=\frac{1}{3}x-\frac{1}{2}\)

\(\Leftrightarrow\frac{-15}{12}x=\frac{1}{3}x-\frac{1}{2}-\frac{3}{2}\)

\(\Leftrightarrow\frac{1}{3}x-\frac{1}{2}-\frac{3}{2}=\frac{-15}{12}x\)

\(\Leftrightarrow\frac{1}{3}x-\left(\frac{1}{2}+\frac{3}{2}\right)=\frac{-15}{12}x\)

\(\Leftrightarrow2=\frac{1}{3}x-\frac{-5}{4}x\)

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

\(\Leftrightarrow\frac{19}{12}x=2\)

\(\Leftrightarrow x=2\times\frac{12}{19}\)

\(\Leftrightarrow x=\frac{24}{19}\)

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

\(\Leftrightarrow2\left(x+2\right)=\left(2x+1\right)\times\frac{1}{2}\)

\(\Leftrightarrow2x+4=x+\frac{1}{2}\)

\(\Leftrightarrow2x+4-x=\frac{1}{2}\)

\(\Leftrightarrow2x-x=\frac{1}{2}-4\)

\(\Leftrightarrow x=-3,5\)

\(\Leftrightarrow x=-3,5\)

1/3 - 5/6 ( x + 1 ) = 0,5

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

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

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

                               x + 1    = -1/6 : 5/6

                               x +1     =  -1/5

                              x           =  -1/5 - 1

                             x            =   -6/5

\(\frac{1}{3}-\frac{5}{6}.\left(x+1\right)=0.5\)

\(\frac{5}{6}.\left(x+1\right)=\frac{1}{3}-0.5\)

\(\frac{5}{6}.\left(x+1\right)=\frac{-1}{6}\)

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

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

\(x=\frac{-1}{5}-1\)

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

Vậy \(x=\frac{-6}{5}\)

CHÚC BẠN HỌC TỐT

 x=1, y=7

các bạn sửa A=26x+3y+2015z nha

\(C=\frac{a}{b+c}+\frac{b}{a+c}+\frac{c}{a+b}\)

\(>\frac{a}{a+b+c}+\frac{b}{a+b+c}+\frac{c}{a+b+c}=1\)

\(D< \frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{2016.2017}\)

\(\Rightarrow D< 1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{2016}-\frac{1}{2017}\)

\(\Rightarrow D< 1-\frac{1}{2017}< 1\)

Vậy C > D