Question

1) Решите задачу при помощи уравнения: Путешественники купили в Англии 1.2 кг конфет и 0.8 кг печенья к столу. За все заплатили 5.96 фунтов. Известно, что 1 кг конфет дороже 1 кг печенья на 1.3 фунта стерлингов. Сколько стоит 1 кг конфет? 2) При каких a верно - a > a ?

Answer 1

1. Пусть 1 кг конфет стоит х фунтов, тогда 1 г печенья стоит (х - 1,3) фунтов.

1,2х + 0,8 (х - 1,3) = 5,96;
1,2х + 0,8х - 1,04 = 5,96;
2х = 5,96 + 1,04;
2х = 7;
х = 3,5.

Ответ: 1 кг конфет стоит 3,5 фунтов.

2. Если а - отрицательное число.
(например, если а = - 5, то -(-5) > - 5, т.е 5 > - 5.)

Answer 2

Problem 1: Finding the cost of 1 kg of candy

To solve this problem, we can set up a system of equations based on the given information.

Let's assume the cost of 1 kg of candy is x pounds.

Given: - The travelers bought 1.2 kg of candy and 0.8 kg of cookies, and the total cost was 5.96 pounds. - 1 kg of candy is more expensive than 1 kg of cookies by 1.3 pounds.

Based on these assumptions, we can set up the following equations:

Equation 1: 1.2x + 0.8(x - 1.3) = 5.96

Let's solve this equation to find the value of x.

Simplifying Equation 1: 1.2x + 0.8x - 1.04 = 5.96 2x - 1.04 = 5.96 2x = 7 x = 7/2 x = 3.5

Therefore, the cost of 1 kg of candy is 3.5 pounds.

Problem 2: Conditions for a > a

The expression "a > a" is a comparison between two variables, both named "a". In this case, the comparison is between the same variable, which doesn't make logical sense. The statement "a > a" will always be false regardless of the value of "a".

To have a meaningful comparison, we need to compare two different variables or use different operators. For example, we can compare "a" with another variable "b" using the greater than operator (>). In that case, the condition "a > b" can be true or false depending on the values of "a" and "b".

But in the case of "a > a", the condition will always be false.