Răspuns:
2. [tex]\sqrt{(x2-x1)^{2} + (y2-y1)^{2} }[/tex]=[tex]\sqrt{(10-7)^{2} + (-80+59)^{2} }[/tex] =[tex]\sqrt{9+441}[/tex]= [tex]\sqrt{450}[/tex]=
=15[tex]\sqrt{2}[/tex]
3. s= 2 ( 4x-11=-3 4x=8 x=8:4=2) N( 2,-3)
4. Nu ( trebuia ( coordonatele pct L sa fie suma coordonatelor pct D si S
adica 2-7 =8
