Question

Doar 5 va roooog
Dau 12 puncte si coroana
Repede

Answer 1

a) x=$\frac{3*10}{5} =6$
b) $x= \frac{15*7}{21} = \frac{15}{3}=5$
c) $\frac{x+2}{x+7} = \frac{3(x+2)}{48}$
x+2 se simplifica , 3 cu 48 la fel si ramane
$\frac{1}{x+7}= \frac{1}{16}$
x+7=16
x=16-7=9

Answer 2

a)3/5=x/10
5x=3 x 10
5x=30
x=30 :5=6
x=6

b) 7/x=21/15
21x=7 x 15
21x=105
x=105:21=5
x=5

c) x+2/x+7=3x+6/48
simplificam 3x+6/48 cu 3 si obtinem x+2/16
x+7=16
x=16-7
x=9