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aratati ca n=2019+2×(1+2+3+....+2018) este patrat perfect

Răspuns :

Pdary885
n=2019+2×(2018×2019÷2)
n=2019+2018×2019
n=2019 (1+2018)
n=2019×2019
n=patrat perfect

Răspuns

n = 2019 + 2×(1 + 2 + .. + 2018)

n = 2019 + 2×2018×2019 : 2

n = 2019 + 2018×2019

n = 2019·(1 + 2018)

n = 2019×2019 = patrat perfect

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