Question

ma poate ajuta cineva sa le rezolv corect?

Answer 1

[tex]a) \frac{2}{3}x- \frac{1}{5}= \frac{3}{10}|*30\\ \frac{2*30}{3}x-\frac{1*30}{5}=\frac{3*30}{10}\\ 2*10x-1*6=3*3\\ 20x-6=9\\ 20x=9+6\\ 20x=15\\ x= \frac{15}{20}\\ x= \frac{3}{4} [/tex]
[tex]b) \frac{x}{2}-\frac{4x}{3}+\frac{7x}{6}=7|*6\\ \frac{6*x}{2}-\frac{4x*6}{3}+\frac{7x*6}{6}=7*6\\ 3x-2*4x+7x=42\\ 3x-8x+7x=42\\ 2x=42\\ x=42:2\\ x=21 [/tex]

Answer 2

a)2x/3-1/5=3/10   |*30 
   20x-6=9 ...  20x=15  ...  x=15/20=3/4.

b) x/2 -4x/3+7x/6=7   |*6
     3x-8x+7x=42
               2x=42
                 x=21