máy tính ra :

1.5383844_x10¹¹

=153838440000

sao pn ko nhân thêm 0 đi là đẹp

A)  7/38 x 9/11 +7/38 x 4/11 -7/38 x 2/11

=7/38.(9/11+4/11-2/11)

=7/38

B) 5/31 x 21/25 + 5/31 x -7/10 - 5/31 x 9/20

=5/31.(21/25-7/10-9/20)

=5/31.(-31/100)

=-1/20

17-(3+x)+15-|-3|=2+2x

17-3-x+15-3=2+2x

26-x=2+2x

-x-2x=2-26

-3x=-24

x=8

Ta có: \(17-\left(3+x\right)+15-\left|-3\right|=2+2x\)

\(\Leftrightarrow17-3-x+15-3-2-2x=0\)

\(\Leftrightarrow-3x+24=0\)

\(\Leftrightarrow-3x=-24\)

hay x=8

( X + 5,42 ) x 17 = 142,29

X + 5,42 = 142,29 : 17

X + 5,42 = 8,37

X = 8,37 - 5,42

X = 2,95

X x 8 + X x 15 = 653,2

X x ( 8 + 15 ) = 653,2

X x 23 = 653,2

X = 653,2 : 23

x = 28,4

( x + 5,42 ) x 17 = 142,29                             x . 8 + x . 15 = 653,2

  x + 5,42 = 142,29 : 17                                x . ( 8 + 15 ) = 653,2

  x + 5,42 = 8,37                                           x . 23 = 653,2

  x = 8,37 - 5,42                                            x = 653,2 : 23

  x = 2,95                                                      x = 28,4

x + 5,42 x 17 = 142,29

x + 5.42 =142,29 : 17

x + 5,42 = 8,37

x = 8,37 - 5,42

x = 2,95

X x 8 + X x 15 = 653,2

X x(8 + 15) = 653,2

X x 23 = 653,2

X = 653,2 : 23

X = 28,4

a) \(\dfrac{4}{7}\times x=\dfrac{5}{9}+\dfrac{1}{5}=\dfrac{34}{45}\)

\(x=\dfrac{34}{45}:\dfrac{4}{7}=\dfrac{119}{90}\)

b) \(\dfrac{11}{15}:x=\dfrac{2}{3}-\dfrac{9}{15}=\dfrac{1}{15}\)

\(x=\dfrac{11}{15}:\dfrac{1}{15}=11\)

a) 4/7 x X - 1/5 = 5/9   

     4/7 x X         = 5/9 + 1/5

     4/7 x X         =  34/45

             X          = 34/45 : 4/7

             X          =  119/90

 b)9/15 + 11/15 : X = 2/3

               11/15 : X = 2/3 - 9/15

               11/15 : X =  1/15

                           X = 11/15 : 1/5 

                           X = 11

a: =>7/9:x=1/18-2/9=1/18-4/18=-3/18=-1/6

=>x=-7/9:1/6=-7/9*6=-42/9=-14/3

b: =>x*7/5=2/15+2/5=8/15

=>x=8/15:7/5=8/21

c: =>x-1/2=3/14:4/7=3/8

=>x=3/8+4/8=7/8

d: =>0,4x+0,3x-0,2x=0,7

=>0,5x=0,7

=>x=1,4

7/10

MG42E3RSDáidsdPDIOHSA8DR0RYE9FHEUCnd09f7eqg03

bài2 \(x\times\dfrac{15}{16}-x\times\dfrac{4}{16}=2\) 

     \(x\times\dfrac{11}{16}=2\) 

     \(x=2:\dfrac{11}{16}\) 

    \(x=\dfrac{32}{11}\)

Bài 1 : 

 \(\dfrac{x}{16}\times\left(2017-1\right)=2\)

          \(\dfrac{x}{16}\times2016=2\)

                      \(\dfrac{x}{16}=\dfrac{2}{2016}\)

                         \(x=\dfrac{2}{2016}\times16\)

                         \(x=\dfrac{1}{63}\)

1- (5\(\dfrac{4}{9}\) +x+7\(\dfrac{7}{18}\)) : 15\(\dfrac{3}{4}\) = 0 

1- (\(\dfrac{49}{9}+x+\dfrac{133}{18}\)) : \(\dfrac{63}{4}=0\) 

 (\(\dfrac{49}{9}+\dfrac{133}{18}\)+\(x\) ) : \(\dfrac{63}{4}\) = 1 - 0 

       (\(\dfrac{77}{6}\) + \(x\) ) : \(\dfrac{63}{4}\) = 1

         \(\dfrac{77}{6}+x\)         = 1 x \(\dfrac{63}{4}\) 

          \(\dfrac{77}{6}\) + \(x\)          = \(\dfrac{63}{4}\)

                  \(x\)            = \(\dfrac{63}{4}\) - \(\dfrac{77}{6}\)

                  \(x=\) \(\dfrac{35}{12}\)

558 - (15 : x + 29) x 17 = 14 

\(\Rightarrow\left(15:x+29\right)\times17=558-14\)

\(\Rightarrow\left(15:x+29\right)\times17=544\)

\(\Rightarrow15:x+29=544:17\)

\(\Rightarrow15:x+29=32\)

\(\Rightarrow15:x=32-29\)

\(\Rightarrow15:x=3\)

\(\Rightarrow x=15:3\)

\(\Rightarrow x=5\)

Vậy x = 5

\(\left(x+40\right)\times15=75\times24\)

\(\Rightarrow\left(x+40\right)\times15=1800\)

\(\Rightarrow x+40=1800:15\)

\(\Rightarrow x+40=120\)

\(\Rightarrow x=120-40\)

\(\Rightarrow x=80\)

Vậy x = 80