1/125 * x + 7/8 = 2

1/125 * x          = 2-7/8

1/125 * x          = 9/8

            x           = 1/125:9/8

            x           = 8/1125

5

\(\frac{1}{125}\cdot x+\frac{7}{8}=2\)

\(\frac{1}{125}\cdot x=2-\frac{7}{8}\)

\(\frac{1}{125}\cdot x=\frac{9}{8}\)

\(x=\frac{9}{8}:\frac{1}{125}\)

\(x=\frac{9}{8}\cdot125\)

\(x=\frac{1125}{8}\)

\(\frac{1}{125}\times x+\frac{7}{8}=2\)

\(\frac{1}{125}\times x=2-\frac{7}{8}\)

\(\frac{1}{125}\times x=\frac{16}{8}-\frac{7}{8}\)

\(\frac{1}{125}\times x=\frac{9}{8}\)

\(x=\frac{9}{8}\div\frac{1}{125}\)

\(x=\frac{9}{8}\times125\)

\(x=\frac{1125}{8}\)

\(\frac{1}{125}\cdot x+\frac{7}{8}=2\)

=>\(\frac{1}{125}\cdot x=2-\frac{7}{8}\)

=> \(\frac{1}{125}\cdot x=\frac{9}{8}\)

=>\(x=\frac{9}{8}:\frac{1}{125}\)

=>\(x=\frac{9}{8}\cdot125\)

=>\(x=\frac{1125}{8}\)

4.2x – 3 = 125

4.2x = 125 + 3

4.2x = 128

2x = 128 : 4

2x = 32

2x = 25

x = 5

Vậy x = 5

Ta có: \(\frac{4+x}{7+y}=\frac{4}{7}\)

nên 7(4+x)=4(7+y)

28+7x=28+4y

nên 7x=4y

hay \(\frac{x}{4}=\frac{y}{7}\)

=(x+y)/(4+7)=55/11=5

Suy ra x=5.4=20;y=5.7=35

nhớ Thanks nha bạn

Các thầy cô và các bạn giúp em với ạ

( 4,5 - 2.x ) . 11/7 = 11/14

4,5 - 2.x               = 11/14 : 11/7= 1/2

         2.x             =  4,5 - 1/2 =4

             x  = 4:2=2

\(\left(4,5-2x\right).1\frac{4}{7}=\frac{11}{14}\)

\(\Rightarrow\left(4,5-2x\right).\frac{11}{7}=\frac{11}{14}\)

\(\Rightarrow4,5-2x=\frac{11}{14}:\frac{11}{7}\)

\(\Rightarrow4,5-2x=\frac{11}{14}.\frac{7}{11}\)

\(\Rightarrow4,5-2x=\frac{1}{2}\)

\(\Rightarrow2x=4,5-\frac{1}{2}\)

\(\Rightarrow2x=4,5-0,5\)

\(\Rightarrow2x=4\)

\(\Rightarrow x=4:2\)

\(\Rightarrow x=2\)