Question

 

gu

 

giup mik b highlight voi

Answer 1

Lời giải:
d. 

$(3x+2)(\frac{-2}{5}x-7)=0$

$\Rightarrow 3x+2=0$ hoặc $\frac{-2}{5}x-7=0$

$\Rightarrow 3x=-2$ hoặc $\frac{-2}{5}x=7$

$\Rightarrow x=\frac{-2}{3}$ hoặc $x=\frac{-35}{2}$

g.

$x-\frac{7}{12}x+\frac{3}{8}x=\frac{5}{24}$

$\Rightarrow x(1-\frac{7}{12}+\frac{3}{8})=\frac{5}{24}$

$\Rightarrow x.\frac{19}{24}=\frac{5}{24}$

$x=\frac{5}{24}: \frac{19}{24}=\frac{5}{19}$

f. $\frac{6}{-x}=\frac{x}{-24}$

$\Rightarrow (-x).x=6(-24)$

$\Rightarrow x^2=144=12^2=(-12)^2$
$\Rightarrow x=12$ hoặc $x=-12$
o.

$\frac{x-2}{5}=\frac{1-x}{6}$

$\Rightarrow 6(x-2)=5(1-x)$

$\Rightarrow 6x-12=5-5x$

$\Rightarrow 11x=17$

$\Rightarrow x=\frac{17}{11}$