[tex]1) P= l^{2};l= \sqrt{P}= \sqrt{8 x^{2}y-4 x^{2} y } = \sqrt{4 x^{2} y(2-1)} = \sqrt{ 2^{2}* x^{2} *y*1 }
[/tex][tex]=2x \sqrt{y} [/tex]
[tex]3) V2=V1*2 \sqrt{9} = \sqrt{5} x^{2} y*2 \sqrt{9} = \sqrt{5} x^{2} y*2*3=6 \sqrt{5} x^{2} y [/tex]
[tex]4) (x+3)^{2} +(x-1)^{2} +(x-2)^{2} =(x^{2} +2x*3+3^{2})+(x^{2} -2x+1^{2})+[/tex][tex]+( x^{2} -2x*2+ 2^{2} )= x^{2} +6x+9+ x^{2} -2x+1+ x^{2} -4x+4=[/tex]
[tex]=3 x^{2} +14[/tex]
[tex]5) AD^{2} =CD*DB;
CD+DB=CB;
BD= \frac{30}{100} DC;
[/tex][tex]CB= \frac{30}{100}DC+DC= \frac{130}{100}DC=26hm=2600m;
DC =2600: \frac{130}{100}= [/tex]
[tex]=2600* \frac{100}{130} =[/tex]
Se simplifica 2600 si 130 prin 130[tex]= \frac{20}{100}= [/tex]
Se simplifica 20 si 100 prin 20 [tex]= \frac{1}{5} [/tex]
