Question

3×12^-2 3^-2-(-3)^-1 3×4^-2+2^-3

Answer 1

Ответ:

312`

Объяснение:

потому чтоооооооооооооооооо12,%3×2-2

Answer 2

Let's break down the expression step by step:

1. $3 \times 12^{-2}$: $12^{-2}$ means $1/(12^2)$, so $12^{-2} = \frac{1}{144}$. Now, $3 \times \frac{1}{144} = \frac{3}{144} = \frac{1}{48}$.

2. $3^{-2}$: $3^{-2}$ means $1/(3^2)$, so $3^{-2} = \frac{1}{9}$.

3. $-(-3)^{-1}$: $(-3)^{-1}$ means the reciprocal of $-3$, which is $-\frac{1}{3}$.

4. $3 \times 4^{-2}$: $4^{-2}$ means $1/(4^2)$, so $4^{-2} = \frac{1}{16}$. Now, $3 \times \frac{1}{16} = \frac{3}{16}$.

5. $2^{-3}$: $2^{-3}$ means $1/(2^3)$, so $2^{-3} = \frac{1}{8}$.

Now, let's put it all together and calculate the final expression:

$\frac{1}{48} + \frac{1}{9} - \left(-\frac{1}{3}\right) + \frac{3}{16} + \frac{1}{8}$

To add these fractions, we need a common denominator, which is $48$:

$\frac{1}{48} + \frac{16}{48} - \frac{16}{48} + \frac{9}{48} + \frac{6}{48} = \frac{16}{48} = \frac{1}{3}$