Chọn B nha

HT

3,2 x x + 0,24 = 46

3,2 x x            = 46 - 0,24 

3,2 x x            = 45,76

              x       = 45,76 : 3,2 

             x        = 14,3 

Vay x= 14,3 

\(3,2x+0,24=46\)

\(3,2x=45,76\)

\(x=14,3\)

vậy \(x=14,3\)

`1/7+(-9/27)+10/7+(-4/7)`

`= (1/7 + (-4)/7+10/7) +(-9/27)`

`= 7/7 +(-9/27)`

`= 1 +(-9/27)`

`= 27/27 + (-9/27)`

`=18/27`

`=2/3`

__

`1,3 xx2 1/4 -1,3 xx3 1/4`

`= 1,3 xx 9/4 -1,3 xx 13/4`

`=1,3 xx (9/4-13/4)`

`=1,3xx(-4)/4`

`=1,3 xx (-1)`

`=-1,3`

__

`1/4: x = 2,4 -4/5`

`=> 1/4 : x= 12/5 -4/5`

`=> 1/4 : x=8/5`

`=> x=1/4 : 8/5`

`=> x= 1/4 xx 5/8`

`=> x= 5/32`

__

`5/4 ( x- 3/5)= -1/8`

`=> x-3/5 = -1/8 : 5/4`

`=> x-3/5 = -1/8 xx 4/5`

`=> x-3/5 =-4/40`

`=> x-3/5 =-1/10`

`=> x=-1/10 +3/5`

`=> x=-1/10 + 6/10`

`=> x= 5/10`

`=>x=1/2`

` @ yngoc`

0.48 x 530 + 0.24 x 156 x 2 + 4 x 314 x 0.12

= 254,4 + 37,44 x 2 + 1256 x 0,12

= 254,4 + 74,88 + 150,72

= 329,28 + 150,72

= 480

0,48 x 530 + 0,24 x 156 x 2 + 4 x 314 x 0,12

= 0,48 x 530 + 0,48 x 156 + 0,48 x 314

= 0,48 x ( 530 + 156 + 314 )

= 0,48 x 1000

= 480

0.48 x 530 +0.24 x 156 x 2 + 4 x 314 x 0.12

= 254.4 + 74.88 + 150.72

= 480

0,24 x 450 + 0,8 x 15 x 3 + 3 x 4 x8

=0,24 x 100 x 4,5 + 0,8 x 3 x 15 + 3 x 8 x 4

=24 x 4,5 + 2,4 x 10 x 1,5 + 24 x 4

=24 x 4,5 + 24 x 1,5 + 24 x 4

=24 x (4,5 + 1,5 + 4)=24 x 10 = 240

0,24 x 450 + 0,8 x 15 x 3 + 3 x 4 x 8

= 0,24 x 100 x 45 + 0,8 x 3 x 15 + 3 x 8 x 4

= 24 x 4,5 + 2,4 x 15 + 24 x 4

= 24 x 4,5 + 24 x 1,5 + 24 x 4

= 24 x ( 4,5 + 1,5 + 4 )

= 24 x 10 = 240

ai giai ho minh bai toan nay thi minh h cho

0.24x450+0.8x15x3+3x3x8

A.  x - 3,5  =  2,4 + 1,5

              x  =  3,9 + 3,5

              x  =  7,4

B.  x + 6,14  =  27,8 - 8,6

               x  =  19,2 - 6,14 

                  x  = 12,8

C.  4,3 x  x  =  3,8 x 4,3

                x  =  3,8 x 4,3 : 4,3

                x  =  3,8

D.   7, 3 x x + 2,7 x x = 10

       x x ( 7, 3  + 2,7 ) = 10

                               x  = 10 : 10

                               x = 1

x*0.24+x*8.86=0.36

x*(0.24+8.86)=0.36

x*9.1=0.36

x=0.36:9.1

x=0.03
 

a)

\(\begin{array}{l}x + \left( { - \frac{1}{5}} \right) = \frac{{ - 4}}{{15}}\\x = \frac{{ - 4}}{{15}} + \frac{1}{5}\\x = \frac{{ - 4}}{{15}} + \frac{3}{{15}}\\x = \frac{{ - 1}}{{15}}\end{array}\)                 

Vậy \(x = \frac{{ - 1}}{{15}}\).

b)

\(\begin{array}{l}3,7 - x = \frac{7}{{10}}\\x = 3,7 - \frac{7}{{10}}\\x = \frac{{37}}{{10}} - \frac{7}{{10}}\\x=\frac{30}{10}\\x = 3\end{array}\)

Vậy \(x = 3\).

c)

\(\begin{array}{l}x.\frac{3}{2} = 2,4\\x.\frac{3}{2} = \frac{{12}}{5}\\x = \frac{{12}}{5}:\frac{3}{2}\\x = \frac{{12}}{5}.\frac{2}{3}\\x = \frac{8}{5}\end{array}\)

Vậy \(x = \frac{8}{5}\)       

d)

\(\begin{array}{l}3,2:x =  - \frac{6}{{11}}\\\frac{{16}}{5}:x =  - \frac{6}{{11}}\\x = \frac{{16}}{5}:\left( { - \frac{6}{{11}}} \right)\\x = \frac{{16}}{5}.\frac{{ - 11}}{6}\\x = \frac{{ - 88}}{{15}}\end{array}\)

Vậy \(x = \frac{{ - 88}}{{15}}\).

0.25 x 4 x 3.6 : 0.125=1x3,6x1:8=0,45

5.79 x 0.24 - 0.12 x 1.58=0,24x5=1,2

nhớ k mình nhé

( 260 -359 ) - (-350 + 260 ) = (260 - 260 ) +( -359 +350) = 0 +(-9) = -9

sửa lạu đề tí nha  47 x 0.24 + 53 x0.24 = 0,24.(47+53) =  0,24 . 100 =24