\(128\times\left(\frac{3}{2x}-\frac{1}{4}\right)^3=-250.\)

\(\left(\frac{3}{2x}-\frac{1}{4}\right)^3=-250\div128\)

\(\left(\frac{3}{2x}-\frac{1}{4}\right)^3=\frac{125}{64}\)

\(\left(\frac{3}{2x}-\frac{1}{4}\right)^3=\left(\frac{5}{4}\right)^3\)

\(\Rightarrow\frac{3}{2x}-\frac{1}{4}=\frac{5}{4}\)

\(\Rightarrow\frac{3}{2x}=\frac{5}{4}+\frac{1}{4}\)

\(\Rightarrow\frac{3}{2x}=\frac{3}{2}\)

\(\Rightarrow2x=2\)

\(\Rightarrow x=1\)

     \(128x\left(\frac{3}{2}X-\frac{1}{4}\right)^3=-250\)

\(\left(=\right)\left(\frac{3}{2}X-\frac{1}{4}\right)^3=-250:128\)

\(\left(=\right)\left(\frac{3}{2}X-\frac{1}{4}\right)^3=-\frac{125}{64}\)

\(\left(=\right)\left(\frac{3}{2}X-\frac{1}{4}\right)^3=\left(-\frac{5}{4}\right)^3\)

\(\left(=\right)\frac{3}{2}X-\frac{1}{4}=-\frac{5}{4}\)

\(\left(=\right)\frac{3}{2}X=-\frac{5}{4}+\frac{1}{4}\)

\(\left(=\right)\frac{3}{2}X=-\frac{4}{4}\)

\(\left(=\right)\frac{3}{2}X=-1\)

\(\left(=\right)X=-1:\frac{3}{2}\)

\(\left(=\right)X=-\frac{2}{3}\)

Vậy \(X=-\frac{2}{3}\)

250 : x + 3.5 = 5^2

=> 250:x = 25 - 15 = 10

=> x = 250 : 10 = 25

ta có 

\(20\times x-\left(1+2+..+20\right)=150\)

\(\Leftrightarrow20\times x-20\times\frac{21}{2}=150\)

\(\Leftrightarrow20\times x-210=150\Leftrightarrow20x=360\)

hay x=18

Trả lời :

Ta có :

\(20\times x-\left(1+2+...+20=150\right)\)

\(\Leftrightarrow20\times x-20\times\frac{21}{2}=150\)

\(\Leftrightarrow20\times x-210=150\)

\(\Leftrightarrow20x=360\)

\(\Rightarrow x=18\)

x=18 nha

đáp án

tích hộ mình

250 nhân 4 là 1000 nhân tiếp với 2007 là 2,007,000

cảm ơn bạn nhé

4 x 2007 x 250

= (4 x 250) x 2007

= 1000       x 2007

= 2 007 000

Bài 1: 

a: =-153-45=-198

b: =65+274=339

a) -12.(x - 5) + 7(3 - x) = 5

=> -12x + 60 + 21 - 7x = 5

=> -19x + 81 = 5

=> -19x = 5 - 81

=> -19x = -76

=> x = -76 : (-19)

=> x = 4

b) (x + 1) + (x + 2) + (x + 3) + ... + (x + 20) = 250

=> (x + x + x + ... + x) + (1 + 2 + 3 + ... + 20) = 250

=> 20x + 210 = 250

=> 20x = 250 - 210

=> 20x = 40

= > x = 40 : 20

=> x = 2

\(-12\left(x-5\right)+7\left(3-x\right)=5\)

\(\Leftrightarrow-12x+60+21-7x=5\)

\(\Leftrightarrow-19x+81=5\)

\(\Leftrightarrow81-5=19x\)

\(\Leftrightarrow19x=76\)

\(\Leftrightarrow x=4\)

\(\left(x+1\right)+\left(x+2\right)+\left(x+3\right)+...+\left(x+20\right)=250\)

\(\Leftrightarrow20x+\left(1+2+3+...+20\right)=250\)

\(\Leftrightarrow20x+\frac{20\left(20+1\right)}{2}=250\)

\(\Leftrightarrow20x+210=250\)

\(\Leftrightarrow20x=40\)

\(\Leftrightarrow x=2\)

\(25.\left(x+3\right)=250\)

\(x+3=250:25\)

\(x+3=10\)

\(x=10-3\)

\(\Rightarrow x=7\)

x = 7

25.(x + 3) = 250

x + 3 = 250 : 25

x + 3 = 10

x = 10 - 3 = 7

Vậy x = 7.

a) 576 : x - 30 = 2

576 : x = 2 + 30

576 : x = 32

x = 576 : 32

x = 18

b) 180 - ( x - 45 ) : 2 = 120

( x - 45 ) : 2 = 180 - 120

( x - 45 ) : 2 = 60

x - 45 = 60 * 2

x - 45 = 120

x = 120 + 45

x = 165

a﴿ 576 : x ‐ 30 = 2

576 : x = 2 + 30

576 : x = 32

x = 576 : 32

x = 18

b﴿ 180 ‐ ﴾ x ‐ 45 ﴿ : 2 = 120

﴾ x ‐ 45 ﴿ : 2 = 180 ‐ 120

﴾ x ‐ 45 ﴿ : 2 = 60

x ‐ 45 = 60 * 2

x ‐ 45 = 120

x = 120 + 45

x = 165 

      X =1         Chúc bạn học tốt

giải chi tiết giúp mình nhé

bằng 186 lấy 150;3= 50 - 17-17= lấy 150+36 = 186