39 x 25 + 78 x 16 + 39 + 39 x 42

= 39 x 25 + 2 x16  + 39 + 39 x 42

= 39 x (25 + 2 + 1 + 42)

= 39 x 70

= 2730

\(\dfrac{70}{39}\times\dfrac{13}{14}-\dfrac{13}{25}:\dfrac{39}{50}=\dfrac{5}{3}-\dfrac{13}{25}\times\dfrac{50}{39}=\dfrac{5}{3}-\dfrac{2}{3}=1\)

\(\dfrac{70}{39}\cdot\dfrac{13}{14}-\dfrac{13}{25}:\dfrac{39}{50}\)

\(=\dfrac{5}{3}-\dfrac{13}{25}\cdot\dfrac{50}{39}\)

\(=\dfrac{5}{3}-\dfrac{2}{3}\)

=1

1

`x:0,25+x xx11=39`

`=>x xx 4+x xx11=39`

`=>x xx (4+11)=39`

`=>x xx 15=39`

`=>x=39:15`

`=>x=13/5`

đề sai hay bạn sai đây ?

 957 nhé tớ ca hát

Kết quả rất đơn giản là 22425

39x25x23=22425

\(x-39:13=25\)

\(\Leftrightarrow x-3=25\)

\(\Leftrightarrow x=28\)

Vậy x = 28

x - 39 : 13 = 25 

x - 3          = 25

x                = 25 + 3 

x                = 28

Vậy x = 28

Ta có: x-39:13=25

nên x-3=25

hay x=28

Vậy: x=28

25 - (39 + x) = x - (13 - 39)

<=> 25 - 39 - x = x - ( - 26 )

<=> - 14 - x = x + 26

<=> - 14 - 26 = x + x

<=> - 40 = 2x

=> x = - 20

\(25-\left(39+x\right)=x-\left(13-19\right)\)

      \(25-39-x=x-\left(-6\right)\)

             \(-14-x=x+6\)

                \(-x-x=6+14\)

                      \(-2x=20\)

                             \(x=20:\left(-2\right)\)

                             \(x=-10\)

Tk mk nhé!Chắc chắn 100%!

25 - (39 + x) = x - (13 - 19)

25 - 39 - x = x - 13 + 19

-x - x = -13 + 19 - 25 + 39

-2x = 20

x = 20 : (-2)

x = -10

39x25+32x125

=975+4000

=4975

39 x 25 + 32 x 125 = 975 + 4000 = 4975

39x25+32x125

=975+4000

=4975

a) | x - 25 | - | -7 | = 16

| x - 25 | - 7 = 16

| x - 25 | = 16 + 7

| x - 25 | = 23

| x | = 23 + 25

| x | = 48 => x = 48 hc x = -48

b) 12 - ( x - 39 ) = 39 - ( -15 )

12 - ( x - 39 ) = 54

x - 39 = 12 - 54

x - 39 = -42

x = -42 + 39

x = -3