Răspuns :
a) 2x+1=x+9
2x-x=9-1
X=8
B) x-2= 21/10 : 14/5
X-2= 21/10 • 5/14 ( Simplificăm 10 si 5 cu 5 si pe 21 si 14 cu 7)
X-2= 3/2 • 1/2
X-2= 3/4
X= 3/4 -2
X= 3/4 - 8/4
X= -5/4
2x-x=9-1
X=8
B) x-2= 21/10 : 14/5
X-2= 21/10 • 5/14 ( Simplificăm 10 si 5 cu 5 si pe 21 si 14 cu 7)
X-2= 3/2 • 1/2
X-2= 3/4
X= 3/4 -2
X= 3/4 - 8/4
X= -5/4
a) 2(x+1)=x+9
-2x+2=x+9
-2x-x=9-2
-x=7
b)[tex]\frac{14}{5}[/tex] (x-2)=[tex]\frac{21}{10}[/tex]
- x-2=[tex]\frac{5}{14}[/tex]*[tex]\frac{21}{10}[/tex] -(se simplifica cu 5 si cu 7)
- x-2=[tex]\frac{1}{2}[/tex]*[tex]\frac{3}{2}[/tex] -(se rezolva inmultirea)
- x-2=[tex]\frac{3}{4}[/tex]
- x=[tex]\frac{3}{4}[/tex] +2 -(aplificam cu 4 )
- x= [tex]\frac{3}{4}[/tex]+[tex]\frac{8}{4}[/tex]
- x=[tex]\frac{11}{4}[/tex]