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versachexdior
@versachexdior
December 2022
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#7 Функция f(x) для произвольных натуральных чисел x, y удовлетворяет условию f(x+y)=f(x)+f(y)+2xy. Если f(1)=4, найдите значение f(8).
A 72 B 36 C 84 D 88
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jefterkallelp5x8nk
Verified answer
Ответ:
D
Пошаговое объяснение:
f(x + y) = f(x) + f(y) + 2xy
f(1) = 4
f(8) = ?
x = 1; y = 1
f(1 + 1) = f(1) + f(1) + 2.1.1
f(2) = 4 + 4 + 2
f(2) = 10
x = 2; y = 2
f(2 + 2) = f(2) + f(2) + 2.2.2
f(4) = 10 + 10 + 8
f(4) = 28
x = 4; y = 4
f(4 + 4) = f(4) + f(4) + 2.4.4
f(8) = 28 + 28 + 32
f(8) = 88
Надеюсь это поможет.
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Report "#7 Функция f(x) для произвольных натуральных чисел x, y удовлетворяет условию f(x+y)=f(x)+f(y)+2xy. Если f(1)=4, найдите значение f(8). A 72 B 36 C 84 D 88 "
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Answers & Comments
Verified answer
Ответ:D
Пошаговое объяснение:
f(x + y) = f(x) + f(y) + 2xy
f(1) = 4
f(8) = ?
x = 1; y = 1
f(1 + 1) = f(1) + f(1) + 2.1.1
f(2) = 4 + 4 + 2
f(2) = 10
x = 2; y = 2
f(2 + 2) = f(2) + f(2) + 2.2.2
f(4) = 10 + 10 + 8
f(4) = 28
x = 4; y = 4
f(4 + 4) = f(4) + f(4) + 2.4.4
f(8) = 28 + 28 + 32
f(8) = 88
Надеюсь это поможет.