`1,24.(-4,5)+1,24.(-5,5)`

`= 1,24 . [-4,5 +(-5,5) ]`

`= 1,24 . (-10)`

`=-12,4`

\(x\times1,8=36\)

\(x=36:1,8\)

\(x=20\)

----------------

\(x\times1,24=3,1\)

\(x=3,1:1,24\)

\(x=2,5\)

X x 1,8 = 36

X = 3 : 1,8

X = 20

X x 1,24 = 3,1

X = 3,1 : 1,24

X = 2,5

1: \(\Leftrightarrow2x-1\in\left\{1;-1;2;-2;3;-3;4;-4;6;-6;8;-8;12;-12;24;-24\right\}\)

=>\(x\in\left\{1;0;\dfrac{3}{2};-\dfrac{1}{2};2;-1;\dfrac{5}{2};-\dfrac{3}{2};\dfrac{7}{2};-\dfrac{5}{2};\dfrac{9}{2};-\dfrac{7}{2};\dfrac{13}{2};-\dfrac{11}{2};\dfrac{25}{2};-\dfrac{23}{2}\right\}\)

2: =>x+6+9 chia hết cho x+6

=>\(x+6\in\left\{1;-1;3;-3;9;-9\right\}\)

hay \(x\in\left\{-5;-7;-3;-9;3;-15\right\}\)

3: =>2x+4+15 chia hét cho x+2

=>\(x+2\in\left\{1;-1;3;-3;5;-5;15;-15\right\}\)

=>\(x\in\left\{-1;-3;1;-5;3;-7;13;-17\right\}\)

a) 18.24 x ( 5.6 + 4.4 )

= 18.24 x 10 

=182.4 .

b)2,07 x ( 88.2 + 11.8 )

= 2,07*100

= 207 .

c) = 251.7 x ( 125 - 25 )

 = 251.7 x 100 

 = 25170 . 

d) = ( 1.24 x 2 ) +99 

 = 2.48+99

 = 101.48. 

k mình nha ! 

a,
18,24 x 5,6 + 18,24 x 4,4
= 18,24 x ( 5,6 + 4,4 )
= 18,24 x 10
= 182,4
b, 
2,07 x 88,2 + 2,07 x 11,8
= 2,07 x ( 88,2 + 11,8 )
= 2,07 x 100
= 207
c, 
251,7 x 125 - 251,7 x 25
= 251,7 x ( 125 - 25 )
= 251,7 x 100
= 25100
d,
1,24 + 1,24 + 99
= 2,48 + 99
= 101,48

`2,15-x=3,05`

`x=2,15-3,05`

`x=-0,9`

Vậy `x=-0,9`

__________________

`0,12-(2x-5)=1,88`

`2x-5=0,12-1,88`

`2x-5=-1,76`

`2x=-1,76+5`

`2x=3,24`

`x=3,24:2`

`x=1,62`

Vậy `x=1,62`

__________________

`1,74-3,5:x=1,24`

`3,5:x=1,74-1,24`

`3,5:x=0,5`

`x=3,5:0,5`

`x=7`

Vậy `x=7`

Vậy 

__________________

Vậy 

__________________

Vậy 

a )18,24 x 5,6 + 18,24 x 4,4

= 18,24 x ( 5,6 + 4,4 )

= 18,24 x 10

= 182,4

b ) 2,07 x 88,2 + 2,07 + 11,8

= 2,07 x ( 88,2 x 11,8 )

= 2,07 x 100

= 207

c ) 251,7 x 125 - 251,7 - 25

= 251,7 x ( 125 - 25 )

= 251,7 x 100

= 25170

d) 1,24 + 1,24 x 99

= 1,24 x 1 + 1,24 x 99

= 1,24 x ( 1 + 99 )

= 1,24 x 100

= 124

a) 18,24 x 5,6 + 18,24 x 4,4

= 18,24 x (5,6 + 4,4)

= 18,24 x 10 = 182,4

b) 2,07 x 88,2 + 2,07 x 11,8

   = 2,07 x (88,2 + 11,8)

  = 2,07 x 100 = 207

c)251,7 x 125 - 251,7 x 25

  = 251,7 x (125 - 25)

  = 251,7 x 100 = 25170

d) 1,24 + 1,24 x 99

   = 1,24 x (99 + 1)

   = 1,24 x 100 = 124

a, =18,24*(5,6+4,4)

=18,24*100

=1824

b, =2,07*(82,2+11,8)

=2,07*100

=207

c, =1,24*(99+1)

=1,24*100

=124

`y : 6,8 = 1,24`

`=> y= 1,24 xx 6,8`

`=> y= 8,432`

Y = 1,24 x 6,8 
Y = 8,432

\(-66\left(\dfrac{1}{2}-\dfrac{1}{3}+\dfrac{1}{11}\right)+1,24\cdot\left(-37\right)+63\cdot\left(-1,24\right)\)

\(=-66\cdot\dfrac{17}{66}+\left(-1,24\right)\cdot37+63\cdot\left(-1,24\right)\)

\(=-17+\left(1,24\right)\left(37+63\right)\)

\(=-17+\left(-1,24\right)\cdot100\)

\(=-17+\left(-124\right)\)

\(=-141\)

\(1,24+1,26=\frac{5}{2}=2,5\)      k mk nha 

Các bạn k mk mk k lại cho

1,24+1,26=3,5

Bạn Pokemon XYZ làm sai mà được 1 k