Question

aratati ca urmatoarele numere sunt patrate perfecte si apoi calculati radical din2 a) n=2^74-2^73-2^72 b) n=(1+2+3+......+80-40×17):10

Answer 1

2^72(4-2-1)=2^72=(2^36)²,p.p si √n=2^36

al doilea

(80*81/2-40*17):10=8*81/2-4*17=4*81-4*17=4(81-17)=4*64=2²*8²=(2*8)², p.p si√n=2*8=16