Question

hai phần ba x - một phần hai x= năm phần mười hai

25%x + ba phần tư x+x=bảy phần tám

 

Answer 1

Ta có

a/ 1/3x - 3/4x = 5/12                         1/4x + 3/4 +x =7/8

x(1/3-3/4)=5/12                                   2x=7/8

-5/12x=5/12                                            x=7/8 : 2 =7/16

x=5/12 : -5/12

x=-1

Answer 2

a) \(\frac{2}{3}x-\frac{1}{2}x=\frac{5}{12}\)

\(x\left(\frac{2}{3}-\frac{1}{2}\right)=\frac{5}{12}\)

\(x\left(\frac{4}{6}-\frac{3}{6}\right)=\frac{5}{12}\)

\(\frac{1}{6}x=\frac{5}{12}\)

\(x=\frac{5}{12}:\frac{1}{6}=\frac{5}{2}\)

b) \(25\%x+\frac{3}{4}x+x=\frac{7}{8}\)

\(x\left(25\%+\frac{3}{4}+1\right)=\frac{7}{8}\)

\(x\left(\frac{1}{4}+\frac{3}{4}+1\right)=\frac{7}{8}\)

\(x\left(1+1\right)=\frac{7}{8}\)

\(2x=\frac{7}{8}\)

\(x=\frac{7}{8}:2=\frac{7}{16}\)

Answer 3

Ta có:

a)\(\frac{2}{3}x-\frac{1}{2}x=\frac{5}{12}\)

\(\left(\frac{2}{3}-\frac{1}{2}\right)x=\frac{5}{12}\)

\(\left(\frac{4}{6}-\frac{3}{6}\right)x=\frac{5}{12}\)

\(\frac{1}{6}x=\frac{5}{12}\)

\(x=\frac{5}{12}:\frac{1}{6}\)

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

b)  \(25\%.x+\frac{3}{4}x+x=\frac{7}{8}\)

      \(\left(25\%+\frac{3}{4}+1\right)x=\frac{7}{8}\)

     \(\left(\frac{1}{4}+\frac{3}{4}+1\right)x=\frac{7}{8}\)

        \(2x=\frac{7}{8}\)

       \(x=\frac{7}{8}:2\)

       \(x=\frac{7}{16}\)