2+4+6+8+...+50

có:(50-2):2+1=25(số)

=>2+4+6+..+50=(2+50).25:2=650

=>x.(x+1)=650=25.25

=>x=25

vậy x=25

tick nhé

25 đó bạn ạ

\(4\left(2x+9\right)+\left(-8x+3\right)-\left(x-3\right)=0\)

\(\Rightarrow8x+38-8x+3-x+3=0\)

\(\Rightarrow8x-8x-x=0-3-3-38\)

\(\Rightarrow-x=-44\)

\(\Rightarrow x=44\)

4(2x + 9) + (-8x + 3) - (x - 3) = 0

=> 8x + 36 - 8x + 3 - x + 3 = 0

=> -x + 42 = 0

=> -x = -42

=> x = 42

Giải cho bạn 2 bài tìm x nhé! Bài kia dễ,tự giải

a) \(3^{x+2}-3^x=8.243\Leftrightarrow3^x.3^2-3^x=1944\)

\(\Leftrightarrow3^x\left(3^2-1\right)=1944\Leftrightarrow3^x.8=1944\)

\(\Leftrightarrow3^x=243=3^5\Leftrightarrow x=5\)

b) \(1+2+3+...+x=210\)

\(\Leftrightarrow\frac{x\left(x+1\right)}{2}=210\Leftrightarrow x\left(x+1\right)=420\)

\(\Leftrightarrow20\left(20+1\right)=420\Rightarrow x=20\)

thank ^ - ^

a) \(4+x=\frac{x+1}{5}\)

\(5.\left(4+x\right)=x+1\)

\(20+5.x=x+1\)

\(5.x-x=1-20\)

4.x = -19

x = -19/4

2) \(\frac{7}{x-1}=\frac{x}{8}\)

\(x.\left(x-1\right)=7.8\) ( x; x- 1 là 2 số tự nhiên liên tiếp)

=> x = 8

a) 3/8 . x = 9/8 - 1

3/8 . x = 1/8

x = 1/8 : 3/8

x = 1/3

b) 4/5 . x = 7/5 - 1/5

4/5 . x = 6/5

x = 6/5 : 4/5

x = 3/2

c) 12/7 : x + 2/3 = 7/5

12/7 : x = 7/5 - 2/3

12/7 : x = 11/15

x = 12/7 : 11/15

x = 180/77

d) 3.(x + 7) - 15 = 27

3.(x + 7) = 27 + 15

3.(x + 7) = 42

x + 7 = 42 : 3

x + 7 = 14

x = 14 - 7

x = 7

a) \(\dfrac{3}{8}x=\dfrac{9}{8}-1\)

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

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

b) \(\dfrac{4}{5}x=\dfrac{7}{5}-\dfrac{1}{5}\)

\(\Rightarrow\dfrac{4}{5}x=\dfrac{6}{5}\)

\(\Rightarrow x=\dfrac{6}{5}:\dfrac{4}{5}=\dfrac{3}{2}\)

c) \(\dfrac{12}{7}:x+\dfrac{2}{3}=\dfrac{7}{5}\)

\(\Rightarrow\dfrac{12}{7}:x=\dfrac{7}{5}-\dfrac{2}{3}\)

\(\Rightarrow\dfrac{12}{7}:x=\dfrac{11}{15}\)

\(\Rightarrow x=\dfrac{12}{7}:\dfrac{11}{15}=\dfrac{180}{77}\)

d) \(3\left(x+7\right)-15=27\)

\(\Leftrightarrow3\left(x+7\right)=42\)

\(\Leftrightarrow x+7=14\Leftrightarrow x=7\)

Ý 1 là x= 4 ; y=8

Ý 2 là x= 3 và 1 ; y = 1 và 2

Ý 3 là x= 2 ; y = 4

giải cách làm ra đi bạn

ĐẦU BÀI SAI ............................................................................................................................RỒI !

Bài ko sai nha bạn !!!

\(\frac{x}{3}=\frac{5}{8}+\frac{1}{8}\)

\(\frac{x}{3}=\frac{6}{8}=\frac{3}{4}\)

\(\Rightarrow x\cdot4=3^2\)\(x=\frac{9}{4}\)hay\(x=2.25\)

á lộn 

x/3-1/8=5/8

x/3      = 6/8

x /3         =3/4

x.4=3.3

x.4=9

x=9/4