-36

tick cho minh

\(x=\dfrac{7}{25}+\dfrac{-1}{5}=\dfrac{7}{25}-\dfrac{1}{5}=\dfrac{2}{25}.\\ x=\dfrac{5}{11}+\dfrac{4}{-9}=\dfrac{5}{11}-\dfrac{4}{9}=\dfrac{1}{99}.\\ \dfrac{5}{9}-\dfrac{x}{-1}=\dfrac{-1}{3}\Leftrightarrow\dfrac{5}{9}+x=-\dfrac{1}{3}.\Leftrightarrow x=-\dfrac{8}{9}.\)

\(x=\dfrac{7}{25}+-\dfrac{1}{5}=>\dfrac{7}{25}+-\dfrac{5}{25}=>x=\dfrac{2}{25}\)

\(x=\dfrac{5}{11}+\dfrac{4}{-9}=>\dfrac{-45}{-99}+\dfrac{44}{-99}=>x=\dfrac{-1}{-99}=\dfrac{1}{99}\)

\(\dfrac{5}{9}-\dfrac{x}{-1}=-\dfrac{1}{3}=>-\dfrac{1}{3}-\dfrac{5}{9}=>\dfrac{x}{-1}=-\dfrac{8}{9}=>x=-\dfrac{8}{9}\)

\(x=\dfrac{7}{25}+\dfrac{-1}{5}\\ \Rightarrow x=\dfrac{7}{25}+\dfrac{-5}{25}\\ \Rightarrow x=\dfrac{2}{25}\\ x=\dfrac{5}{11}+\dfrac{4}{-9}\\ \Rightarrow x=\dfrac{-45}{-99}+\dfrac{44}{-99}\\ \Rightarrow x=\dfrac{45}{99}+\dfrac{44}{99}\\ \Rightarrow x=\dfrac{95}{99}\\ \dfrac{5}{9}-\dfrac{x}{-1}=\dfrac{-1}{3}\\ \Rightarrow\dfrac{x}{-1}=\dfrac{5}{9}-\dfrac{-1}{3}\\ \Rightarrow\dfrac{x}{-1}=\dfrac{5}{9}-\dfrac{-3}{9}\\ \Rightarrow\dfrac{x}{-1}=\dfrac{8}{9}\Rightarrow x\cdot9=-1\cdot8=-8\\ \Rightarrow x\cdot9=-8\\ \Rightarrow x=\dfrac{-8}{9}\)

5x + 25 =50

 x = 50 - 25

x = 5 

t i c k mik nha  

5x + 25 =50

5x              =25

x                 = 5

Tk nhá

Chúc bn hk giỏi

...............^^

5x + 25 = 50

        5x = 50 - 25

        5x = 25

          x = 25 : 5

          x = 5

mik nha

(x+1)+(x+5)+(x+9)+......+(x+25)=105

=>25xX+(1+2+3+...+25)=105

=>24xX+325=105

=>24xX=-220

=>x=??

sai đề ak

bài này sai đề nha bn :

-thứ nhất toán lớp 5 chưa học số âm

-thứ hai hết

cậu sai rồi thì phải.

x=50

MÌNH K BẠN RỒI ĐÓ

x vẫn bằng 50

k mik nha

2x - 25 = 100 - 25

2x - 25 = 75

      2x = 75 + 25

       2x = 100

         x = 50

ai k mik mik k lại

x+x+25=315

2x+25=315

2x=390

x=145

vậy x=145.

x + x + 25 = 315

2x +25      = 315

2x             = 315 - 25

2x             = 290

x               =290 :2

x               = 145

x + x + 25 = 315

x x 2 + 25 = 315

      x x 2 = 315 - 25

      x x 2 = 290

           x = 290 : 2

           x = 145

ai k mik mik k lại

ko lừa ai đâu

\(x^{20}=x\)

⇒\(x^{20}-x=0\)

⇒\(x\left(x^{19}-1\right)=0\)

⇔\(x^{19}-1=0\) hoặc x=0

⇔x=1 hoặc x=0

\(x^{20}=x\\ \Leftrightarrow x^{20}-x=0\\ \Leftrightarrow x\left(x^{19}-1\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}x=0\\x=1\end{matrix}\right.\)

\(x^{20}=x\\ \Rightarrow x\in\left\{0;1\right\}\)vì \(x\in N\)

X × 2,5 + 7,5 = 36,5

X × 2,5 = 36,5 - 7,5

X × 2,5 = 29

  X = 29 : 2,5

  X = 11,6

\(x\times2,5+7,5=36,5\\ x\times2,5=36,5-7,5\\ x\times2,5=29\\ x=29:2,5\\ x=11,6\)

\(x:15=\dfrac{1}{3}\)

\(x=5\)

\(x:15=\dfrac{1}{3}\Leftrightarrow x=5\)

\(x:15=\dfrac{8}{24}\)

\(\Rightarrow x:8=\dfrac{1}{3}\)

\(\Rightarrow x=\dfrac{1}{3}.15\)

\(\Rightarrow x=5\)