Explicație pas cu pas:
n=V(2+4+...+48+25)=>n=V2(1+2+.....+24)+25=>
n=V(2*24*25/2+25)=>n=V(24*25+25)=>n=V25(24+1)=>
n=V25*25=V25²=25€N (A)
n=|V3-3|+V(7-4V3)-V(2V3-4)²=>
n=3-V3+V(4-4V3+3)-|2V3-4|=>
n=3-V3+V(2-V3)²-(4-2V3)=>
n=3-V3+|2-V3|-4+2V3=>n=3-V3+2-V3-4+2V3=>n=1€N (A)
n=|x+3|+V(x-1)²+|-7| =>
n=|x+3|+|x-1|+7
-3<=x<=1 => 0<=x+3 si x-1<=0
=> n=x+3+1-x+7=>n=11€N (A)
