a ) X x 6 - 4,99 = 25,01                                               b ) X : 6 = 7/4

     X x 6           = 25,01 + 4,99                                         X : 6 = 1,75

     X x 6           = 30                                                         X      = 1,75 x 6

     X                 = 30 : 6                                                    X      = 10,5

     X                 = 5

a) \(6x-4,99=25,01\)

\(6x=25,01+4,99\)

\(6x=30\)

\(x=5\)

vậy \(x=5\)

b) \(\frac{x}{6}=\frac{7}{4}\)

\(\Rightarrow4x=6.7\)

\(\Rightarrow4x=42\)

\(\Rightarrow x=10,5\)

vậy \(x=10,5\)

a) x*6-4,99=25,01

=>x*6=25,01+4,99

=>x*6=30

=>x=30:6

=>x=5

Vậy x=5

Tìm x : 

a) X x 6 - 4,99 = 25,01

X x 6 = 25,01 + 4,99

X x 6 = 30

X = 30 : 6

X = 5

b) \(x\times6=\frac{7}{4}\)

\(x=\frac{7}{4}\div6\)

\(x=\frac{7}{24}\)

~ happy new year ~

+) Ta có: \(x\times6-4,99=25,01\)

                           \(x\times6=30\)

                                     \(x=5\)

+) Ta có: \(\left(x+8,4\right):5=2,2\)

                          \(x+8,4=11\)

                                        \(x=2,6\)

X x 6 - 4,99 = 25,01

X x 6            = 25,01 + 4,99

X x 6            = 30

X                  = 30 : 6

X                   = 5

Vậy X = 5.

( x + 8,4 ) : 5 = 2,2

  x + 8,4         = 2,2 x 5

  x + 8,4         = 11

  x                  = 11 - 8,4

  x                  = 2,6

Vậy x = 2,6.

   X x 6 - 4,99 = 25,01

<=> X x 6 = 30

<=> X = 5

Vậy...

   (x + 8,4) : 5 = 2,2

<=> x + 8,4 = 11

<=> x = 2,6

Vậy....

Học tốt hmi hmi:))

\(y=\left(25+4,99\right):6=\dfrac{2999}{600}\)

y x 6 - 4,99 = 25

y x 6=25+4,99=29,99

y=29,99:6=4.9983.......

y x 6 - 4,99 = 25

y x 6 = 25 + 4,99

y x 6 = 29,99

y = 29,99 : 6 

y = 4,998

\(y.3\dfrac{7}{12}=6\dfrac{1}{4}\)

\(y.\dfrac{43}{12}=\dfrac{25}{4}\)

\(y=\dfrac{25}{4}:\dfrac{43}{12}\)

\(y=\dfrac{25.12}{4.43}\)

\(y=\dfrac{75}{43}\)

Sai đề e ơi

Yx7/3=3/2

Y=7/3x3/2

Y=7/2

a)khi x=8 thì y=15

=> 8.15=120

Vậy hai đại lượng x và y tỉ lệ nghịch với nhau theo hệ số tỉ lệ là 120.

b) biểu diễn x theo y:

y=a/c=> y=120/8=>a=8.15

c) khi x =6

=>y=120/6

=>y=20

Khi x=10

=>y=120:10

=>y=12.

\(6-2\left(x-1\right)=4\)

\(\Rightarrow2\left(x-1\right)=6-4\)

\(\Rightarrow2\left(x-1\right)=2\)

\(\Rightarrow x-1=1\)

\(\Rightarrow x=1+1=2\)

________________

\(2\cdot\left(x-2\right)+1=7\)

\(\Rightarrow2\cdot\left(x-2\right)=7-1\)

\(\Rightarrow2\cdot\left(x-2\right)=6\)

\(\Rightarrow x-2=3\)

\(\Rightarrow x=3+2=5\)

_______________

\(\left(2\cdot x-3\right)+4=9\)

\(\Rightarrow2\cdot x-3=5\)

\(\Rightarrow2\cdot x=3+5\)

\(\Rightarrow2\cdot x=8\)

\(\Rightarrow x=\dfrac{8}{2}=4\)

________________

\(\left(3\cdot x-2\right)-1=3\)

\(\Rightarrow3\cdot x-2=3+1\)

\(\Rightarrow3\cdot x-2=4\)

\(\Rightarrow3\cdot x=6\)

\(\Rightarrow x=\dfrac{6}{3}=2\)

a: =>2(x-1)=2

=>x-1=1

=>x=2

b: =>2(x-2)=6

=>x-2=3

=>x=5

c; =>2x-3=5

=>2x=8

=>x=4

d: =>3x-2=4

=>3x=6

=>x=2

e: =>2(6-x)=4

=>6-x=2

=>x=4

f: =>x-2=5

=>x=7

g: =>10-2x=4

=>2x=6

=>x=3

h: =>2x+4=3

=>2x=-1

=>x=-1/2

j: =>x+2=12

=>x=10

l: =>2x+3=3

=>2x=0

=>x=0

\(6-2\left(x-1\right)=4\\ 2\left(x-1\right)=6-4=2\\ x-1=\dfrac{2}{2}=1\\ x=1+1=2\)

\(2\left(6-x\right)+1=5\\ 2\left(6-x\right)=5-1=4\\ 6-x=\dfrac{4}{2}=2\\ x=6-2=4\)

\(\left(4+2x\right)-1=8\\ 3\left(4+2x\right)=8+1=9\\ 4+2x=\dfrac{9}{3}=3\\ 2x=3-4=-1\\ x=-\dfrac{1}{2}\)

\(2\left(x-2\right)+1=7\\ 2\left(x-2\right)=7-1=6\\ x-2=\dfrac{6}{2}=3\\ x=3+2=5\)

\(20+\left(x-2\right)=25\\ x-2=25-20=5\\ x=5+2=7\)

\(\left(x+2\right)-5=7\\ x+2=7+5=12\\ x=12-2=10\)

\(\left(2x-3\right)+4=9\\ 2x-3=9-4=5\\ 2x=5+3=8\\ x=\dfrac{8}{2}=4\)

\(\left(10-\dfrac{2}{x}\right)-1=3\\ 10-\dfrac{2}{x}=3+1=4\\ \dfrac{2}{x}=10-4=6\\ x=\dfrac{2}{6}=\dfrac{1}{3}\)

\(\left(3+2x\right)-1=3\\ 3+2x=3+1=4\\ 2x=4-3=1\\ x=\dfrac{1}{2}\)

\(\left(3x-2\right)-1=3\\ 3x-2=3+1=4\\ 3x=4+2=6\\ x=\dfrac{6}{3}=2\)