ủa cho mk hỏi X ở đâu vậy....

\(\left(4.25\right).x=388600\\ 100.x=388600\\ x=388600:100\\ x=3886\)

4 x X x 25 = 388600

100 x X = 388600

=> x = 388600 : 100 = 3886

5*x*25=388600             

(5*25)*x=388600               

125*x=388600           

x=388600:125             

x=3 108,8                 

Vậy x=3 108,8

5*x*25=388600             

(5*25)*x=388600               

125*x=388600           

x=388600:125             

x=3 108,8                 

Vậy x=3 108,8

\(y=12-\left(\dfrac{1}{3}\times4\right)=12-\dfrac{4}{3}=\dfrac{32}{3}\)

\(y=\left(\dfrac{12}{35}\times\dfrac{14}{9}\right)-\dfrac{2}{5}=\dfrac{8}{15}-\dfrac{2}{5}=\dfrac{2}{15}\)

a) \(y+\dfrac{1}{3}\times4=12\)

\(y+\dfrac{1}{3}=12:4\)

\(y+\dfrac{1}{3}=3\)

\(y=3-\dfrac{1}{3}\)

\(y=\dfrac{8}{3}\)

b) \(\dfrac{2}{5}+y=\dfrac{12}{35}\times\dfrac{14}{9}\)

    \(\dfrac{2}{5}+y=\dfrac{8}{15}\)

           \(y=\dfrac{8}{15}-\dfrac{2}{5}\)

          \(y=\dfrac{2}{15}\)

2/15

\(y.\left(20+16\right)=972\Leftrightarrow36y=972\Leftrightarrow y=27\)

y x (20+ 16) = 972 

y  x 36 = 972

y = 972 : 36

y = 27

=>10y=26,68

hay y=2,668

\(\Rightarrow y\times\left(3,2+6,8\right)=26,68\\ \Rightarrow y\times10=26,68\\ \Rightarrow y=26,68:10\\ \Rightarrow y=2,668\)

\(y\times7=5,6\%\)

\(\Leftrightarrow y\times7=\dfrac{5,6}{100}\)

\(\Leftrightarrow y=\dfrac{5,6}{100}:7=\dfrac{1}{125}\)

1/125

1/125

tính như bth thôi ráng lên bạn nhá

99/32

\(y x 4/9 - 5/8 = 1/2 : 2/3\)

\(y x 4/9 - 5/8 = 3/4\)

\(y x 4/9 = 3/4 + 5/8\)

\(y x 4/9 = 11/8\)

\(y = 11/8 : 4/9\)

\(y = 99/32\)