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7 \cdot 7 = 40

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Викторина

7 \times 7 = 40

Веб-эзләүнең моңа охшаш проблемалары

Jordan Normal Form of

A_{7 \times 7}

with a singal eigenvalue

λ

https://math.stackexchange.com/questions/1683939/jordan-normal-form-of-a-7-times-7-with-a-singal-eigenvalue-lambda

Here's what I think. If the Jordan Normal Form is either

J_{2} (λ), J_{2} (λ), J_{1} (λ), J_{1} (λ), J_{1} (λ)

J_{2} (λ), J_{1} (λ), J_{1} (λ), J_{1} (λ), J_{1} (λ), J_{1} (λ)

How do you find the unknown value of

p \times 8 = 40

https://socratic.org/questions/how-do-you-find-the-unknown-value-of-ptimes8-40

p = 5

p \times 8 = 40

divide both sides by

8

\Rightarrow \frac{p \times 8}{8} = \frac{4 0}{8}

How to find the trace and determinant of a matrix

https://math.stackexchange.com/q/681840

Hint Notice that if

λ

is an eigenvalue of

A

λ^{2}

is an eigenvalue of

A^{2}

x

is an eigenvector of

A

λ

A^{2} x = A (A x) = λ A x = λ^{2} x

2

chosen squares from a chess board have neither any side nor any corner in common

https://math.stackexchange.com/questions/2329250/2-chosen-squares-from-a-chess-board-have-neither-any-side-nor-any-corner-in-co

The cute way to compute the number of pairs that touch at only a corner is that the corners they can touch at must be one of the internal points. For each internal point there are two pairs that can ...

Interview riddle

https://math.stackexchange.com/q/866921

These interview problems are sometimes weird, where notations are bad, rules are arbitrary, and they expect only one answer where several could fit. Here is one, which could be the expected one, but ...

Is 7 prime or irreducible or something else in

Z_{21}

https://math.stackexchange.com/questions/881716/is-7-prime-or-irreducible-or-something-else-in-mathbbz-21

Because 21 is not prime,

Z_{21}

is not an integral domain , which means it has nonzero elements that multiply to zero. Talking about irreducible elements is only really meaningful in an ...

Уртаклык

Клип тактага күчереп

49=40

49 алу өчен, 7 һәм 7 тапкырлагыз.

\text{false}

49 һәм 40 чагыштырыгыз.

Мисаллар

Квадратик тигезләмә

x^{2} - 4 x - 5 = 0

Тригонометрия

4 sin θ cos θ = 2 sin θ

Сызык тигезләмәсе

y = 3 x + 4

Арифметика

699 * 533

[2534] [2 - 1 0135]

Бер үк вакытта тигезләмә

{8 x + 2 y = 46 7 x + 3 y = 47

Дифференциация

\frac{d}{d x} \frac{( 3 x ^{2} - 2 )}{( x - 5 )}

Интеграция

\int_{0}^{1} x e^{- x^{2}} d x

x \to - 3 lim \frac{x ^{2} - 9}{x ^{2} + 2 x - 3}