a) x = - 4.

b) x = -5.

Bài 1:

a) \(\dfrac{9}{20}-\dfrac{8}{15}\times\dfrac{5}{12}\)

\(=\dfrac{9}{20}-\dfrac{2}{9}\)

\(=\dfrac{41}{180}\)

b) \(\dfrac{2}{3}\div\dfrac{4}{5}\div\dfrac{7}{12}\)

\(=\dfrac{2}{3}\times\dfrac{5}{4}\times\dfrac{12}{7}\)

\(=\dfrac{5}{6}\times\dfrac{12}{7}\)

\(=\dfrac{10}{7}\)

c) \(\dfrac{7}{9}\times\dfrac{1}{3}+\dfrac{7}{9}\times\dfrac{2}{3}\)

\(=\dfrac{7}{9}\times\left(\dfrac{1}{3}+\dfrac{2}{3}\right)\)

\(=\dfrac{7}{9}\times1\)

\(=\dfrac{7}{9}\)

Bài 2:

a) \(2\times\left(x-1\right)=4026\)

\(\left(x-1\right)=4026\div2\)

\(x-1=2013\)

\(x=2014\)

Vậy: \(x=2014\)

b) \(x\times3,7+6,3\times x=320\)

\(x\times\left(3,7+6,3\right)=320\)

\(x\times10=320\)

\(x=320\div10\)

\(x=32\)

Vậy: \(x=32\)

c) \(0,25\times3< 3< 1,02\)

\(\Leftrightarrow0,75< 3< 1,02\) ( S )

=> \(0,75< 1,02< 3\)

a. 5(x-7)-4(x+5)=3.5-12

 5x - 5.7 -4x - 4.5 = 15 -12 

x(5-4) -35-20 = 3

x -55 = 3

x = 3+55 

x = 58

vậy x = 58

b. (2x -15)⁵= (2x -15)³

vì (2x -15)⁵= (2x -15)³

=> (2x -15)⁵  = 1 hoặc (2x -15)⁵  = 0 

=> (2x -15)⁵  = 1⁵ hoặc (2x -15)⁵  = 0⁵

=> 2x-15 =1   hoặc 2x-15 = 0

=> 2x = 1+15 hoặc 2x = 0+15

=> 2x =16   hoặc 2x = 15

=> x = 16:2 hoặc x = 15:2

=> x= 8  hoặc x = 7,5 

Vì x \(\in\)N => x = 8

vậy x = 8

Tôi học giỏi toán bạn học lớp mấy vậy

Câu này dễ oẹt

a ) x − 28   :   − 12   =   − 5 x − 28 =   − 5 .   − 12 x − 28     =  6 0   x   =  6 0   + 28 x   =  88

b ) x + 15   :   − 28   =  8 x + 15  = 8 . − 28 x + 15  = −  224   x   =   − 224  –  15 x   =   − 239

c ) x + 3 0   :   − 45   =   −  4 x + 3 0   =   − 4 .   − 45 x + 3 0   =  18 0 x   = 18 0   –  3 0 x   = 15 0

a)<=>(-12)(x-5)+7(3-x)=-(19x-81)

=>-(19x-81)=3.5

=>81-19x=15

=>19x=-66

=>x=\(\frac{66}{19}\)

b)30(x+2)-6(x-5)+(-24)x=2.3^235

=>2.3^2.5=2^2.5^2

=>x vô nghiệm hoặc đề sai

tui mới học lớp 5 thui à

duyệt nha^_^ ^_^

[ ] là ngoặc đơn hả???????????

a. 2(x-1) + (x+2) - (x+3) = 15 - (x+1)

=>2x-2+x+2-x-3=15-x-1

=>(2x+x-x)-2+2-3=15-1-x

=>2x-3=14-x

=>3x=17

=>x=17/3

b. x+1/15 + x+2/14 = x+4/12 + x+5/11

\(\Rightarrow\frac{x+1}{15}+1+\frac{x+2}{14}+1=\frac{x+4}{12}+1+\frac{x+5}{11}+1\)

\(\Rightarrow\frac{x+16}{15}+\frac{x+16}{14}=\frac{x+16}{12}+\frac{x+16}{11}\)

\(\Rightarrow\frac{x+16}{15}+\frac{x+16}{14}-\frac{x+16}{12}-\frac{x+16}{11}=0\)

\(\Rightarrow\left(x+16\right)\left(\frac{1}{15}+\frac{1}{14}-\frac{1}{12}-\frac{1}{11}\right)=0\)

\(\Rightarrow x+16=0\).Do \(\frac{1}{15}+\frac{1}{14}-\frac{1}{12}-\frac{1}{11}\ne0\)

=>x=-16

a) ( 5x - 15) .37 =74

5x - 15= 74 : 37

5x - 15 = 2

5x = 2 + 15

5x = 17

x = 17: 5

x= \(\frac{17}{5}\)