Question

Помогите. Задача:Компьютер и монитор вместе стоят 12000руб.,монитор и принтер 7000р., а компьютер и принтер 9400р. Сколько стоят компьютер, принтер и монитор вместе?

Answer 1

!!!!!!!!!!!
скорее всего 16.700

Answer 2

Problem Analysis

To solve this problem, we need to find the individual prices of the computer, monitor, and printer. We are given three equations:

1. Computer + Monitor = 12000 2. Monitor + Printer = 7000 3. Computer + Printer = 9400

We can solve these equations simultaneously to find the values of the computer, monitor, and printer.

Solution

Let's solve the given system of equations step by step:

1. Computer + Monitor = 12000 2. Monitor + Printer = 7000 3. Computer + Printer = 9400

To find the value of the computer, we can subtract equation 2 from equation 3:

(Computer + Printer) - (Monitor + Printer) = 9400 - 7000 Computer - Monitor = 2400

Now, we have two equations:

1. Computer + Monitor = 12000 2. Computer - Monitor = 2400

We can add these two equations to eliminate the variable "Monitor":

(Computer + Monitor) + (Computer - Monitor) = 12000 + 2400 2 * Computer = 14400 Computer = 14400 / 2 Computer = 7200

Now, we can substitute the value of the computer (7200) into equation 1 to find the value of the monitor:

7200 + Monitor = 12000 Monitor = 12000 - 7200 Monitor = 4800

Finally, we can substitute the values of the computer (7200) and monitor (4800) into equation 3 to find the value of the printer:

7200 + Printer = 9400 Printer = 9400 - 7200 Printer = 2200

Therefore, the computer, monitor, and printer together cost 7200 + 4800 + 2200 = 14200 rubles.

Conclusion

The computer, monitor, and printer together cost 14200 rubles.