Question

1.....390+4900:k=460 2....230•a+40=10000:20

Answer 1

Ответ:

390+4900:к=460

5290:к=460

к=5290÷460

к=11,5

230*а+40=10.000:20

230*а+40=500

а=500-40

а=460

а=460÷230

а=2

Answer 2

It looks like you've provided two mathematical expressions with colons and equal signs. It seems like you might want me to solve these equations for the variables involved. Let's solve each equation step by step:

Equation 1: $390 + 4900 \cdot k = 460$ First, let's isolate $k$ on one side of the equation:

Subtract 390 from both sides: $4900 \cdot k = 460 - 390$ $4900 \cdot k = 70$

Now, divide both sides by 4900: $k = \frac{70}{4900}$ $k = \frac{1}{70}$

So, the solution for $k$ is $k = \frac{1}{70}$.

Equation 2: $230 \cdot a + 40 = 10000 \div 20$ Let's solve for $a$ in this equation:

Divide 10000 by 20: $230 \cdot a + 40 = 500$

Subtract 40 from both sides: $230 \cdot a = 500 - 40$ $230 \cdot a = 460$

Now, divide both sides by 230: $a = \frac{460}{230}$ $a = 2$

So, the solution for $a$ is $a = 2$.

To summarize:

1. $k = \frac{1}{70}$
2. $a = 2$