a: \(\Leftrightarrow\left(\dfrac{x+2001}{5}+1\right)+\left(\dfrac{x+1999}{7}+1\right)+\left(\dfrac{x+1997}{9}+1\right)+\left(\dfrac{x+1995}{11}+1\right)=0\)

=>x+2006=0

=>x=-2006

b: \(\Leftrightarrow\left(\dfrac{x-15}{100}-1\right)+\left(\dfrac{x-10}{105}-1\right)+\left(\dfrac{x-100}{5}-1\right)=\left(\dfrac{x-100}{15}-1\right)+\left(\dfrac{x-105}{10}-1\right)+\left(\dfrac{x-110}{5}-1\right)\)

=>x-105=0

=>x=105

Đề đoạn cuối hình như phải là x-400/100 chứ bạn

=> (x+5/105 - 1) + (x+6/106 - 1) + (x+10/110 - 1) + (x-400/100 + 3) = 0

=> x-100/105 + x-100/106 + x-100/110 + x-100/100 = 0

=> (x-100).(1/105 + 1/106 + 1/110 + 1/100) = 0

=> x-100 = 0 ( vì 1/105 + 1/106 + 1/110 + 1/100 > 0 )

=> x = 100

Vậy x = 100

Tk mk nha

cảm ơn bn nhìu

mình ko đáng cái j linh tinh hết đây là các bài toán mà mình ko giải đc

b. (x-7)^x+1-(x-7)^x+11=0

(x-7)^x+1.[1-(x-7)¹⁰]=0

=> (x-7)^x+1=0 hoặc 1-(x-7)¹⁰=0

• (x-7)^x+1= 0 => x-7=0 => x=7

• 1-(x-7)¹⁰=0=> (x-7)¹⁰=1=>x-7=1 hoặc x-7=-1 => x=8 hoặc x=6

Vậy x thuộc {6;7;8}

lớp mấy đấy

\(\frac{x+110}{100}+\frac{x+8}{102}+\frac{x+6}{104}=\frac{x+4}{106}+\frac{x+2}{108}\)

\(\Leftrightarrow\frac{x+110}{100}+\left(\frac{x+8}{102}+1\right)+\left(\frac{x+6}{104}+1\right)=\left(\frac{x+4}{106}+1\right)+\left(\frac{x+2}{108}+1\right)\)

\(\Leftrightarrow\frac{x+110}{100}+\frac{x+110}{102}+\frac{x+110}{104}=\frac{x+110}{106}+\frac{x+110}{108}\)

\(\Leftrightarrow\frac{x+110}{100}+\frac{x+110}{102}+\frac{x+110}{104}-\frac{x+110}{106}-\frac{x+110}{108}=0\)

\(\Leftrightarrow\left(x+110\right)\left(\frac{1}{100}+\frac{1}{102}+\frac{1}{104}+\frac{1}{106}+\frac{1}{108}\right)=0\)

\(\Leftrightarrow x+110=0\) (vì \(\frac{1}{100}+\frac{1}{102}+\frac{1}{104}-\frac{1}{106}-\frac{1}{108}>0\))

\(\Leftrightarrow x=-110\)

Vậy \(x=-110\)

mn giải hộ mik ik

a)X=100

b)X=70

K MKNHA BN

x + 20 - 10 = 110

x + 20 = 110 + 10

x + 20 = 120

x = 120 - 20

x = 100

x + 80 - 50 = 100

x + 80 = 100 + 50

x + 80 = 150

x = 150 - 80

x = 70

x+ 20= 110+10

x+20= 120

      x= 120-20

      x= 100

x+80= 100+50

x+80= 150

      x= 150-80

      x=70 

k nhé