Последнее произведение будет оканчиваться на 5 при n = *3 и n = *5, где * - 0 или любое натуральное число.
Примеры:
n = 3: 3*(2+3) = 3*5 = 15
n = 5: 5*(2+5) = 5*7 = 35
n = 13: 13*(2+13) = 13*15 = 195
n = 15: 15*(2+15) = 15*17 = 255
и т.д.
X(x^2+2x+1)=2(x+1)
x(x+1)²-2(x+1)=0
(x+1)(x²+x-2)=0
(x+1)(x-1)(x+2)=0
x1=-1
x2=1
x3=-2
График функции <span>у=х^4\4 </span>
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