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X2-10x-11=0
<->x2+x-11x-11=0
<->x(x+1)-11(x+1)=0
<-> (x-11)(x+1)=0
<-> x-11=0
Hoặc x+1=0
X=-1
X=11
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\(\left(3x-15\right)^7=0\Rightarrow3x-15=0\)
\(\Rightarrow3x=15\)
\(\Rightarrow x=5\)
\(4^2.x-6=1\Rightarrow16.x=7\)
\(\Rightarrow x=\frac{7}{16}\)
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a) Giải
(\(\frac{15}{10}x+25\)) : \(\frac{2}{3}=60\)
\(=\left(1,5x+25\right)=60.\)\(\frac{2}{3}\)
\(=\left(1,5x+25\right)=40\)
\(=1,5x=40-25=15\)
\(\Rightarrow x=15:1,5=10\)
Vậy x = 10
a ) (15/10 x + 25 ) : 2/3 = 60
<=> 15/10 x + 25 = 60 \(\times\)2/3
<=> 15/10 x + 25 = 40
<=> 15/10 x = 40 - 25
<=> 15/10 x = 15
<=> x = 15 : 15/10
<=> x = 10
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Bài 1:
22 x 567 - 356 x 22 + 22 x 789
= 22 x ( 567 - 356 + 789 )
= 4 x 1000
= 4000
Bài 2:
12x - 10x = 58 + 2010
2x = 390626
x = 390626 : 2
x = 195313
<=> x ( x + 10 ) = 0
\(\Leftrightarrow\hept{\begin{cases}x=0\\10+x=0\end{cases}}\)\(\Leftrightarrow\hept{\begin{cases}x=0\\x=0-10\end{cases}}\)\(\Leftrightarrow\hept{\begin{cases}x=0\\x=-10\end{cases}}\)