Помогите упростить!! 7 класс! 6. 7. 8.. Created by Daniil2263. algebra-ru

Помогите упростить!! 7 класс! 6. 7. 8...

Necromastery (2x+5)/4+x/12-x/3=1.5 |×12;
3(2x+5)+x-4x=18;
6x+15-3x=18;
3x=3;
x=1;
7) (x+3)/2-(5+x)/5=x+4 |*10;
5x+15-10-2x=10x+40;
-7x=35;
x=-5;
8) 2x/7 -x/14=3 | ×14;
4x-x=42;
x=14.

0 votes Thanks 0

skvrttt 6)
$\frac{2x+5}{4}+\frac{x}{12}=\frac{x}{3}|12\\(\frac{2x+5}{1})3+x=(\frac{x}{1})4\\6x+15+x=4x\\-15=7x-4x=3x\\x=-\frac{15}{3}=-5$

7)
$\frac{x+3}{2}-\frac{5+x}{5}=x+4\\\frac{5+x}{5}=\frac{x+3}{2}-\frac{x+4}{1}=\frac{x+3-2(x+4)}{2}=\frac{x+3-2x-8}{2}=\frac{-x-5}{2}\\(5+x)2=5(-x-5)\\10+2x=-5x-25\\2x+5x=-25-10\\7x=-35\\x=-5$

8)
$\frac{2x}{7}-\frac{x}{14}=3\\3=\frac{2x}{7}^{/2}-\frac{x}{14}=\frac{4x}{14}-\frac{x}{14}=\frac{4x-x}{14}\\\frac{3x}{14}=3\\x=14$

2 votes Thanks 1

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