Question

giúp với 

Answer 1

1. $\frac{5}{11}x+4=6\frac{1}{11}$

$\frac{5}{11}x=\frac{23}{11}$

$x=\frac{23}{11}:\frac{5}{11}=\frac{23}{5}$

2. $(x-1)^2=25=5^2=(-5)^2$
$\Rightarrow x-1=5$ hoặc $x-1=-5$

$\Rightarrow x=6$ hoặc $x=-4$

3.

$(2x-1)^3=-64=(-4)^3$

$\Rightarrow 2x-1=-4$

$\Rightarrow 2x=-3$

$\Rightarrow x=\frac{-3}{2}$

 

Answer 2

4.

$2.3^x-405=3^{x-1}$

$6.3^{x-1}-405=3^{x-1}$

$6.3^{x-1}-3^{x-1}=405$

$5.3^{x-1}=405$

$3^{x-1}=81=3^4$

$\Rightarrow x-1=4$

$\Rightarrow x=5$

5.

$2|x+1|-0,5=\sqrt{\frac{1}{9}}=\frac{1}{3}$

$\Rightarrow 2|x+1|=0,5+\frac{1}{3}=\frac{5}{6}$

$\Rightarrow |x+1|=\frac{5}{12}$

$\Rightarrow x+1=\pm \frac{5}{12}$

$\Rightarrow x=\frac{-7}{12}$ hoặc $x=\frac{-17}{12}$

6.

$|2x+1|=|3-x|$
$\Rightarrow 2x+1=3-x$ hoặc $2x+1=x-3$
$\Leftrightarrow x=\frac{2}{3}$ hoặc $x=-4$

Answer 3

1. 

2. 
 hoặc 

 hoặc 

3.