giải phương trình | x-2005 | ^ 2005 + | x - 2006 | ^ 2006=1
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\(\frac{2-x}{2004}-1=\frac{1-x}{2005}-\frac{x}{2006}\)
\(\Leftrightarrow\frac{2-x}{2004}-1+2=\frac{1-x}{2005}+1-\frac{x}{2006}+1\)
\(\Leftrightarrow\frac{2006-x}{2004}=\frac{2006-x}{2005}-\frac{2006-x}{2006}\)
\(\Leftrightarrow\frac{2006-x}{2004}-\frac{2006-x}{2005}+\frac{2006-x}{2006}=0\)
\(\Leftrightarrow\left(2006-x\right)\left(\frac{1}{2004}-\frac{1}{2005}+\frac{1}{2006}\right)=0\)
\(\Leftrightarrow2006-x=0\). Do \(\frac{1}{2004}-\frac{1}{2005}+\frac{1}{2006}\ne0\)
\(\Leftrightarrow x=2006\)
Cho biểu thức hai biến f(x,y) = \left(3x-5y+2\right)\left(2x+4y-4\right)f(x,y)=(3x−5y+2)(2x+4y−4).
Tìm các giá trị của yy sao cho phương trình (ẩn xx) f(x,y)=0f(x,y)=0 nhận x=2x=2 làm nghiệm.
Trả lời: y=y=
hoặc y=y=
Ta có : \(\frac{2-x}{2004}-1=\frac{1-x}{2005}-\frac{x}{2006}\)
\(\Leftrightarrow\frac{2-x}{2004}+1=\frac{1-x}{2005}+1-\frac{x}{2006}+1\)
\(\Leftrightarrow\frac{2-x}{2004}+\frac{2004}{2004}=\frac{1-x}{2005}+\frac{2005}{2005}-\frac{x}{2006}+\frac{2006}{2006}\)
\(\Leftrightarrow\frac{2006-x}{2004}=\frac{2006-x}{2005}+\frac{2006-x}{2006}\)
\(\Leftrightarrow\left(2006-x\right)\left(\frac{1}{2004}-\frac{1}{2005}-\frac{1}{2006}\right)=0\)
\(\Leftrightarrow x-2006=0\)
\(\Rightarrow x=2006\)
Chúc bạn học tốt !!!
Ta có: \(2-x+2005=1-x+2006=-x+2007\)
\(\frac{2-x}{2005}-1=\frac{1-x}{2006}-\frac{x}{2007}\)
\(\Leftrightarrow\frac{2-x}{2005}+1-2=\frac{1-x}{2006}+1+\left(\frac{-x}{2007}+1\right)-2\)
\(\Leftrightarrow\frac{2007-x}{2005}=\frac{2007-x}{2006}+\frac{2007-x}{2007}\)
\(\Leftrightarrow\left(2007-x\right)\left(\frac{1}{2005}-\frac{1}{2006}-\frac{1}{2007}\right)=0\)
\(\Rightarrow2007-x=0\)
\(\Rightarrow x=2007\)
\(\frac{2-x}{2005}-1=\frac{1-x}{2006}-\frac{x}{2007}\)
\(\Leftrightarrow\frac{2-x}{2005}-\frac{1-x}{2006}+\frac{x}{2007}-1=0\)
\(\Leftrightarrow\frac{2-x}{2005}+1-\frac{1-x}{2006}-1+\frac{x}{2007}-1=0\)
\(\Leftrightarrow\left(\frac{2-x}{2005}+1\right)-\left(\frac{1-x}{2006}+1\right)-\left(1-\frac{x}{2007}\right)=0\)
\(\Leftrightarrow\frac{2-x+2005}{2005}-\frac{1-x+2006}{2006}-\frac{2007-x}{2007}=0\)
\(\Leftrightarrow\frac{2007-x}{2005}-\frac{2007-x}{2006}-\frac{2007-x}{2007}=0\)
\(\Leftrightarrow\left(2007-x\right)\left(\frac{1}{2005}-\frac{1}{2006}-\frac{1}{2007}\right)=0\)
\(\Leftrightarrow2007-x=0\) < Vì \(\frac{1}{2005}-\frac{1}{2006}-\frac{1}{2007}\ne0\)>
\(\Leftrightarrow x=2007\)
VẬY \(x=2007\)
x-2006=y
I(y+1)I^2005+IyI^2006=1
=> y=0, y=-1
x=2006 hoac x=2005