Malinaenacheask
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Dem. ca N=13+2·(1+2+..+12) este patrat perfect

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Cristinatibulcaask
N=13+2(1+2+3+.....10+11+12)
se observa ca 1+12=13, 2+11=13, 3+10=13 deci
N=13+2*13*6=13(1+12)=13*13 patrat perfect
N=13+2(1+2+3+.....10+11+12)se observa ca 1+12=13, 2+11=13, 3+10=13 deciN=13+2*13*6=13(1+12)=13*13 patrat perfect

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