Question

решите уравнения :

(1,46 - 1/5х)-(0,86 - 2/9х) = 1

Answer 1

$(1,46-frac{1}{5}x)-(0,86-frac{2}{9}x)=1$

 

$1,46-frac{1}{5}x-0,86+frac{2}{9}x=1$

 

$frac{2}{9}x-frac{1}{5}x=1-1,46+0,86$

 

$frac{2x}{9}-frac{1x}{5}=0,4$

 

$frac{10x-9x}{45}=0,4$

 

$frac{x}{45}=0,4$

 

$x=0,4cdot45$

 

$x=18$