Răspuns :
a)0. 61x=1.65
x=1.65:0.61
x=1.0065
b) (4x-1):3=-1/3
4x-1:3=-1/3
4x-1/3=-1/3
4x=1/3+(-1/3)
4x=1/3-1/3
4x=-2/3
x=2/3:4
x=2/3×1/4
x=1/12
7,2:x=3.6
7.2x•2\1=3. 6
x=1.65:0.61
x=1.0065
b) (4x-1):3=-1/3
4x-1:3=-1/3
4x-1/3=-1/3
4x=1/3+(-1/3)
4x=1/3-1/3
4x=-2/3
x=2/3:4
x=2/3×1/4
x=1/12
7,2:x=3.6
7.2x•2\1=3. 6
[tex]7,2:x=3,6\Leftrightarrow \dfrac{7,2}{x}=3,6|_{\cdot10} \Leftrightarrow \dfrac{72}{x}=36|_{:36}\Leftrightarrow \dfrac{2}{x}=1 \Leftrightarrow x=2.[/tex]