Question

x+6   +  x+8   = x+10 + x+12

1999 + 1997 = 1995 + 1993

 

Answer 1

\(1.x+6+x+8=x+10+x+12\)

\(\Rightarrow2x+14=2x+22\)

\(\Rightarrow0=8\)(vô lý )

2. Không biết để nói cái gì lun

Answer 2

1) \(\frac{x+6}{1999}+\frac{x+8}{1997}=\frac{x+10}{1995}+\frac{x+12}{1993}.\)

\(\Rightarrow\frac{x+6}{1999}+\frac{x+8}{1997}-\frac{x+10}{1995}-\frac{x+12}{1993}=0\)

\(\frac{x+6}{1999}+1+\frac{x+8}{1997}+1-\frac{x+10}{1995}-1-\frac{x+12}{1993}-1=0\)

\(\left(\frac{x+6}{1999}+1\right)+\left(\frac{x+8}{1997}+1\right)-\left(\frac{x+10}{1995}+1\right)-\left(\frac{x+12}{1993}+1\right)=0\)

\(\frac{x+2005}{1999}+\frac{x+2005}{1997}-\frac{x+2005}{1995}-\frac{x+2005}{1993}=0\)

\(\left(x+2005\right).\left(\frac{1}{1999}+\frac{1}{1997}-\frac{1}{1995}-\frac{1}{1993}\right)=0\)

mà \(\frac{1}{1999}+\frac{1}{1997}-\frac{1}{1995}-\frac{1}{1993}\ne0\)

=> x + 2005 = 0

x = -2005

Answer 3

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