👤

exercitiile 11 si 12 va rog mult. ca nu mai țin minte nimic :(​

Exercitiile 11 Si 12 Va Rog Mult Ca Nu Mai Țin Minte Nimic class=

Răspuns :

Vom inmulti in diagonala

11.

[tex]\frac{x+1}{5}= \frac{3}{5} \\\\5(x+1)=5*3\\\\5x+5=15\\\\5x=15-5\\\\5x=10\\\\x=10:5\\\\x=2[/tex]

12.

[tex]\frac{2x-5}{6} =\frac{1}{2} \\\\2(2x-5)=1*6\\\\4x-10=6\\\\4x=6+10\\\\4x=16\\\\x=16:4\\\\x=4[/tex]

11)

[tex]\bf \dfrac{x+1}{5}=\dfrac{3}{5}[/tex]

cand numitorii sunt aceeasi se ezaleaza NUMARATORII

[tex]\bf x+1=3[/tex]

[tex]\bf x=3-1[/tex]

[tex]\boxed{\bf x=2}[/tex]

12)

[tex]\bf \dfrac{2x-5}{6} =\dfrac{1}{2}[/tex]

[tex]\bf 2\cdot (2x-5)=1\cdot 6[/tex]

[tex]\bf 2\cdot (2x-5)= 6\:\:\:|:2\:(impartin \:relatia\:cu\:2)[/tex]

[tex]\bf 2x-5=3[/tex]

[tex]\bf 2x=3+5[/tex]

[tex]\bf 2x=8\:\:|:2[/tex]

[tex]\boxed{\bf x=4}[/tex]