51 + (26 - 3x) : 5 = 55.

=> (26 - 3x) : 5 = 55 - 51

=> (26 - 3x) : 5 = 4

=> 26 - 3x = 4 . 5

=> 26 - 3x = 20

=> 3x = 26 - 20

=> 3x = 6.

=> x = 6 : 3

=> x = 2.

Vậy x = 2.

#Học tốt.

\(51+\left(26-3x\right):5=55\)

           \(\left(26-3x\right):5=55-51\)

           \(\left(26-3x\right):5=4\)

                     \(26-3x=20\)

                                 \(3x=6\)

                                   \(x=2\)             

51+(26-3x):5=55

(26-3x):5=51-55

(26-3x):5=-4

26-3x=-4.5

26-3x=-20

3x=26-(-20)

3x=-46

x=-46:3

x=15,(3)

Ta có : 148 : (x  + 2) = 378

=> x + 2 = 148 : 378

=> x + 2 = 74/189

=> x = 74/189 - 2 

=> x= -304/189 

a) x+2=148:378

x+2=74/189

x=-304/189

b)5.(x+8)=210

x+8=42

x=34

c)51+(26-3x)=275

26-3x=224

3x=-198

x=-66

a)131.x-941=32
131x=32+941=973
x=973:131
  =973/131
b.88-(7+x).3=64
(7+x).3=88-64=24
7+x=24:3=8
x=8-7
x=1
c)51+(26-3x):5=55
(26-3x):5=55-51=4
26-3x=4.5=20
2x=26-20=6
x=6:3=2

a) 131 . x - 941 = 32

     131 . x         = 32 + 941

      131 . x        = 973

               x        = 973 : 131

               x        = 973/131

a) 131 . x - 941 = 32

     131 . x         = 32 + 941

      131 . x        = 973

               x        = 973 : 131

               x        = 973/131

1) 2016 +x = 169x

<=> 2016 = 168x

<=> x=12

2) (26 - 3x) : 5= 4

<=> 26 - 3x = 20

<=> 3x =6

<=> x=2

3) x + 32 - 17 = 21

<=> x + 15 = 21

<=> x= 6

hơi lạ

\(\frac{22\cdot13\cdot17}{55\cdot26\cdot51}\)

\(=\frac{22\cdot13\cdot17}{55\cdot13\cdot2\cdot3\cdot17}\)

\(=\frac{11\cdot2}{55\cdot2\cdot3}\)

\(=\frac{11}{55\cdot3}=\frac{11}{165}\)

\(\frac{22.13.17}{55.26.51}\) = \(\frac{2.11.13.17}{11.5.13.2.17.3}\) = \(\frac{1}{15}\) 

. là dấu nhân nhé

22 x 13 x 17

55 x 26 x 51

=      11 x 2 x 13 x 17

   11 x 5 x 13 x 2 x 17 x 3

= 1

   15

a) \(55-4x-4\left(-x+3\right)=6-2\left(-8-3x\right)\)

\(55-4x+4x-12=6+16+6x\)

\(43-6-16=6x\)

\(6x=21\)

\(x=3,5\)

b) \(-5\left(-2x-6\right)-9\left(4-7x\right)=51-3x+6\left(x-9\right)\)

\(10x+30-36+63x=51-3x+6x-54\)

\(73x-6=-3+3x\)

\(73x-3x=-3+6\)

\(70x=3\)

\(x=\frac{3}{70}\)

c) \(93+\left|6-3x\right|-39=231\)

\(\left|6-3x\right|+54=231\)

\(\left|6-3x\right|=177\)

\(\Rightarrow\orbr{\begin{cases}6-3x=177\\6-3x=-177\end{cases}}\Rightarrow\orbr{\begin{cases}3x=6-177\\3x=6+177\end{cases}}\Rightarrow\orbr{\begin{cases}3x=-171\\3x=183\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=-57\\x=61\end{cases}}\)

a)       \(55-4x-4\left(-x+3\right)=6-2\left(-8-3x\right)\)

\(\Leftrightarrow\)\(55-4x+4x-12=6+16+6x\)

\(\Leftrightarrow\)\(6x+22=43\)

\(\Leftrightarrow\)\(6x=43-22=21\)

\(\Leftrightarrow\)\(x=21:6=3.5\)

Vậy...

b)pt\(\Leftrightarrow10x+30-36+63x=51-3x+6x-54\)

tự tiếp

giúp mình trả lời câu hỏi với!!!

26/39=38/57

55/77=25/35

39/65=51/85

kb với mình nha

Ban oi trình bay cả cách làm nữa nhé 

26/39 = 38/57

55/77 = 25/35

39/65 = 51/85

\(\frac{26}{39}=\frac{38}{57}\)

\(\frac{26}{39}=\frac{2}{3}\)

\(\frac{55}{77}=\frac{5}{7}\)

\(\frac{39}{65}=\frac{3}{5}\)

\(\frac{51}{85}=\frac{3}{5}\)

\(\frac{38}{57}=\frac{2}{3}\)
Các phân số bằng nhau là:

\(\frac{39}{65}=\frac{51}{85}\left(=\frac{3}{5}\right)\)

\(\frac{26}{39}=\frac{38}{57}\left(=\frac{2}{3}\right)\)

\(\frac{26}{39}=\frac{38}{57}\)

\(\frac{55}{77}=\frac{39}{56}\)

ko biết đúng ko

cho mk xin ý kiến các bạn

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