Question

Va rog repede !!! Dau coroana !!! Ex 2 3 4 (daca nu ii stiti pe 3 puteti face si doar 2 si 4 ) Dau 20 puncte si coroana !!!

Answer 1

2. $\frac{3x}{4*x}= \frac{9}{16}$
$\frac{3x}{4*x}= \frac{9}{16},x \neq 0$
$\frac{3}{4}= \frac{9}{16}$
x∈∅

3. $\frac{2}{5}=0.4$
$\frac{7}{10}=0.7$
$\frac{1}{5}=0.5$

4. $\frac{x}{3}= \frac{y}{5}$
5x=y*3
5x=3y
5x:5=3y:5
$x= \frac{3}{5}y$,y∈R

10x-4y=30
10x=30+4y
10x:10=30:10+4y:10
$x=3+ \frac{4}{10}y$
$x=3+ \frac{2}{5}y$,y∈R