Question

25-4*2*(-2)= И объясните где перед 25 и 4 стоит знак минус значит надо умножать -4*2?

Answer 1

1)4*2=8
2)8*(-2)=-16
3)25-16=5
Ответ:5

Answer 2

-4*2=-8
-8*(-2)=16(минус на минус дает плюс)
25+16=41

Answer 3

Let's solve the expression step-by-step:

1. Start with the given expression: 25 - 4 * 2 * (-2)

2. Perform the multiplication first:

   • 4 * 2 = 8 So, the expression becomes: 25 - 8 * (-2)

3. Now, perform the multiplication inside the parentheses:

   • 8 * (-2) = -16 The expression now becomes: 25 - (-16)

4. Finally, perform the subtraction: 25 - (-16) = 25 + 16 = 41

So, the result of the expression is 41.

Regarding your second question about the placement of the minus sign before 25 and 4, it is essential to understand the rules of order of operations in mathematics, commonly remembered through the acronym PEMDAS/BODMAS (Brackets, Orders, Division, Multiplication, Addition, and Subtraction).

According to these rules, multiplication and division take precedence over addition and subtraction. When there is a minus sign before a number (e.g., -4), it signifies the negation or negative value of that number. However, when a minus sign appears between two numbers (e.g., 25 - 4), it denotes subtraction.

So, in the expression 25 - 4 * 2 * (-2), the multiplication is done first, followed by the subtraction. The minus sign before 4 indicates that we need to multiply 4 by 2 and then negate the result. It does not imply that we need to multiply -4 by 2.