\(x+20\%x=-4,8\)

\(\Leftrightarrow x+\frac{1}{5}x=-4,8\)

\(\Leftrightarrow\frac{6}{5}x=-4,8\)

\(\Leftrightarrow x=-4,8:\frac{6}{5}\)

\(\Leftrightarrow x=-4\)

\(x-15\%x=-2\frac{11}{20}\)

\(\Leftrightarrow x-\frac{3}{20}x=\frac{-51}{20}\)

\(\Leftrightarrow\frac{17}{20}x=\frac{-51}{20}\)

\(\Leftrightarrow x=\frac{-51}{20}:\frac{17}{20}\)

\(\Leftrightarrow x=-3\)

\(x+\frac{x}{5}=-4.8\)

\(\frac{6x}{5}=-4.8\)

6x=-24

x=-4

x=-4 nha bạn

Ta có : x + 20%x = -4,8

   >> 100 %x + 20%x = -4,8

\(x+20\%x=-4,8\)

\(\Leftrightarrow x+\frac{1}{5}x=-4,8\)

\(\Leftrightarrow x\left(1+\frac{1}{5}\right)=-4,8\)

\(\Leftrightarrow x=\frac{-4,8}{1,2}\)

\(\Leftrightarrow x=-4\)

x + 20%x = -4,8

<=> x + 1/5x = -4,8

<=>  6/5x = -4,8

           x = -4,8 : 6/5

          x = -4

Vậy x = -4

đúng thì ủng hộ nha

=8,4

==84

** mk nha các bn

4,8 x 0,5 + 16 x 0,25 + 20 : 10

= 2,4 + 4 + 2

= 6,4 + 2 

= 8,4

4200 x 0,02 = 84

Xx1+20% x X = -4,8

Xx(1+20%) = -4,8

Xx1,2=-4,8

X = -4,8 : 1,2 

X = -4

chúc bn học tốt ^^

x + 20% * x =4.8

x * 1 + 0.2 *x =4.8

x * ( 1 + 0.2 ) =4.8

         x * 1.2 =4.8

                x = 4.8 : 1.2

                x = 4

\(72:x=20\)

      \(x=72:20\)

      \(x=3,6\)

\(57:x=3,8\)

      \(x=57:3,8\)

      \(x=15\)

\(24:x=4,8\)

      \(x=24:4,8\)

      \(x=5\)

\(x\times10=8,5\)

           \(x=8,5:10\)

           \(x=0,85\)

72 : \(\chi\) = 20

\(\chi\)        = 72 : 20 

\(\chi\)        = 3,6

57 :\(\chi\) = 3,8

     \(\chi\)  = 57 : 3,8

     \(\chi\)   = 15

24 :\(\chi\) = 4,8

      \(\chi\) = 24 : 4,8

      \(\chi\) = 5

\(\chi\)x 10 = 8,5

\(\chi\)       = 8,5 : 10

\(\chi\)       = 0,85

a) \(\dfrac{24}{32}=\dfrac{15}{20};\dfrac{32}{24}=\dfrac{20}{15};\dfrac{15}{24}=\dfrac{20}{32};\dfrac{32}{24}=\dfrac{24}{15}\)

b) \(\dfrac{4,8}{25,6}=\dfrac{0,6}{3,2};\dfrac{25,6}{4,8}=\dfrac{3,2}{0,6};\dfrac{25,6}{3,2}=\dfrac{4,8}{0,6};\dfrac{3,2}{25,6}=\dfrac{0,6}{4,8}\)

a: \(\dfrac{24}{32}=\dfrac{15}{20};\dfrac{24}{15}=\dfrac{32}{20};\dfrac{32}{24}=\dfrac{20}{15};\dfrac{15}{24}=\dfrac{20}{32}\)

b: \(\dfrac{4.8}{25.6}=\dfrac{0.6}{3.2};\dfrac{4.8}{0.6}=\dfrac{25.6}{3.2};\dfrac{25.6}{4.8}=\dfrac{3.2}{0.6};\dfrac{0.6}{4.8}=\dfrac{3.2}{25.6}\)