Question

Решительно задачу:ширина прямоугольника 3 см, а его длина в 4 раза больше.Запиши,что можно вычислить с помощью дынных выражений. 3*4- (3*4+3)*2- 3*4*3- 3*2+3*4*2- (Звёздочка это умножить)

Answer 1

а = 3 см - ширина прямоугольника

b - ? - в 4 раза больше - длина прямоугольника

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b = 3 * 4 = 12 cм - длина

Р = (3*4 + 3) * 2 = (12 + 3) * 2 = 15 * 2 = 30 см - периметр

S = 3*4 * 3 = 12 * 3 = 36 кв.см - площадь

Р = 3 * 2 + 3*4 * 2 = 6 + 24 = 30 см - периметр

Answer 2

I can help you with this math problem. Here is the translation of your question from Russian to English, using one of the online translators:

Answer in detail. Solve the problem: the width of the rectangle is 3 cm, and its length is 4 times larger. Write down what you can calculate using these expressions. 3*4- (3*4+3)*2- 3*4*3- 3*2+3*4*2- (Asterisk means multiply)

To solve this problem, you need to know the following formulas:

- The perimeter of a rectangle is P = 2(L + W), where L is the length and W is the width. - The area of a rectangle is A = L * W, where L is the length and W is the width.

Given that the width of the rectangle is 3 cm, and its length is 4 times larger, we can find the length by multiplying 3 by 4. So, the length is L = 3 * 4 = 12 cm.

Now, we can use these expressions to calculate different quantities:

- 3 * 4 - This expression gives us the length of the rectangle, which is 12 cm. - (3 * 4 + 3) * 2 - This expression gives us the perimeter of the rectangle, which is (12 + 3) * 2 = 30 cm. - 3 * 4 * 3 - This expression gives us three times the area of the rectangle, which is 12 * 3 * 3 = 108 cm^2. - 3 * 2 + 3 * 4 * 2 - This expression gives us twice the perimeter plus twice the width of the rectangle, which is (30 + 6) * 2 = 72 cm.